What does CON·X·US mean on Lochinvar equipment?

CON·X·US is Lochinvar's remote monitoring and communication platform built into Crest commercial boilers and ARMOR commercial water heaters. It allows facility managers and service technicians to remotely monitor equipment status, receive fault alerts, view historical operating data, and adjust setpoints — accessible through a web browser or mobile device. CON·X·US connects via Ethernet or cellular and supports Modbus and BACnet communication protocols for integration with building automation systems.

Lochinvar · Founded 1939 · A.O. Smith Subsidiary · Lebanon, TN

Lochinvar OEM Replacement Parts —
Knight, Crest, Copper-Fin, ARMOR, Power-Fin & EnergyRite

Q: How do I find the right Lochinvar replacement part for my unit?

You need both the model number and the serial number from the rating plate on your Lochinvar unit. The serial number is critical because Lochinvar has updated parts mid-production run — the same model can use different igniters, sensors, or control boards depending on when it was manufactured. Call Memphis Control Center at (901) 458-2000 with both numbers and we'll identify the exact OEM part number.

Q: What is the most commonly replaced part on a Lochinvar Knight boiler?

The most frequently replaced parts on Lochinvar Knight boilers are hot surface igniters, flame sensors (flame rods), temperature sensors (inlet/outlet), pressure switches, and gas valves. Flame sensor degradation is the leading cause of intermittent lockouts — the sensor develops a carbon coating over time that prevents it from reading the flame signal. Igniters crack or fail from thermal cycling. Pressure switches fail from blocked condensate traps or deteriorated diaphragms.

Q: What is the difference between the Lochinvar Knight WHB and KHB?

The WHB is the wall-mount version of the current-generation Lochinvar Knight fire tube boiler, and the KHB is the floor-mount version. Both use the same fire-tube stainless steel heat exchanger and SMART SYSTEM control. The WHB is designed to hang on a wall, saving floor space, and includes an ECM variable-speed pump as standard. The KHB is free-standing and typically used when wall mounting is not practical or when larger BTU models are needed. Both achieve 95% AFUE efficiency and are available in models from 55,000 to 399,000 BTU/hr.

Q: What replaced the Lochinvar Knight WBN water tube boiler?

The WBN series (water tube, wall-mount) was replaced by the WHN and subsequently the current WHB series (fire tube, wall-mount). The KBN series (water tube, floor-mount) was replaced by the current KHB series. The current-generation Knight fire tube boiler uses a fire-tube stainless steel heat exchanger instead of the earlier water tube design. Parts for WBN and KBN units are still available through Memphis Control Center.

Q: What is the difference between the Lochinvar Crest and Knight boilers?

The Knight is a residential and light commercial condensing boiler ranging from 55,000 to 399,000 BTU/hr — designed for homes, small apartments, and light commercial buildings. The Crest is a large commercial condensing boiler ranging from 750,000 to 6,000,000 BTU/hr — designed for hospitals, universities, hotels, multi-family complexes, and district heating. The Crest uses Lochinvar's proprietary wave fire-tube heat exchanger design, SMART TOUCH control with CON·X·US remote monitoring, and up to 20:1 turndown ratio.

Q: What is the difference between the Lochinvar ARMOR and Copper-Fin commercial water heaters?

The ARMOR (AWN/AWH series) is a condensing commercial water heater with a stainless steel heat exchanger that achieves up to 99% thermal efficiency through heat recovery from flue gases. It requires direct vent installation. The Copper-Fin (CWN/CFN) and Copper-Fin II are atmospheric or direct-vent non-condensing water heaters with copper finned-tube heat exchangers — simpler design, lower first cost, typically 80–85% efficiency. ARMOR is the right choice when maximum efficiency and lower operating cost are priorities. Copper-Fin is appropriate where first cost, simplicity, or available venting favor a non-condensing design.

Q: Who is Lochinvar and who owns them?

Lochinvar, LLC was founded in 1939 (originally as the Walter Vallett Company) and is headquartered in Lebanon, Tennessee at 300 Maddox-Simpson Parkway. In August 2011, Lochinvar was acquired by A.O. Smith Corporation (NYSE: AOS) for $418 million. A.O. Smith is one of the world's largest water heater manufacturers. Lochinvar operates as a wholly owned subsidiary of A.O. Smith, maintaining its own brand, product line, and manufacturing operations in Lebanon, TN. Lochinvar specializes in high-efficiency boilers, commercial water heaters, heat pumps, pool and spa heaters, and storage tanks.

Q: What does SMART SYSTEM mean on a Lochinvar boiler?

SMART SYSTEM is Lochinvar's proprietary integrated operating control used on Knight boilers. It features an LCD display screen, the ability to control up to three independent temperature setpoints, outdoor reset (adjusts boiler temperature based on outdoor air temperature to save energy), night setback, freeze protection, diagnostic fault codes, and modulating burner control. SMART TOUCH is the commercial-grade version used on Crest boilers and ARMOR water heaters, which also includes CON·X·US remote monitoring capability.

Memphis Control Center stocks Lochinvar OEM replacement parts for the full product lineup — Knight boilers (WHB, KHB wall and floor mount), Crest commercial boilers (FBN series), Copper-Fin water heaters (CWN/CFN), ARMOR condensing water heaters (AWN/AWH), Power-Fin (PFN), and EnergyRite pool heaters (ERN). Parts include igniters, flame sensors, gas valves, control boards, pressure switches, heat exchangers, gasket kits, combustion blowers, circulator pumps, anode rods, temperature sensors, and T&P relief valves. We also supply complete Lochinvar units — call for availability and pricing on new equipment.

Browse All Lochinvar Parts Call (901) 458-2000

OEM Lochinvar Parts — Not Aftermarket Knight · Crest · Copper-Fin · ARMOR · Power-Fin 10,000+ Lochinvar SKUs Complete Units Available — Call to Order Memphis Distributor Since 1967

OEM Parts OnlyGenuine Lochinvar OEM replacement parts — not aftermarket. Correct fit, correct specs, and warranty protection for your equipment

10,000+ Lochinvar SKUsOne of the largest Lochinvar parts inventories in the Mid-South — Knight, Crest, Copper-Fin, ARMOR, Power-Fin, EnergyRite, Shield, FTXL, and more

Part Number Lookup HelpHave a model and serial? Call (901) 458-2000 and we'll identify the correct OEM part number — igniters, sensors, boards, gas valves, and more

Same-Day ShippingStocked parts ship same day from Memphis, TN — free. Complete Lochinvar units available by order — call for lead time and pricing

Lochinvar — high-efficiency heating since 1939. The Walter Vallett Company was founded in 1939 marketing residential, commercial, and industrial water heaters. In 1954 the company acquired Michigan Tank and Furnace and purchased the Lochinvar brand name. In 1957 the company was renamed Lochinvar Water Heater Corporation and headquartered in Detroit. Over the following decades Lochinvar became a leader in high-efficiency condensing boiler and water heater technology. The company is credited with developing engineering systems that formed the basis for today's high-efficiency gas appliance designs. In August 2011 A.O. Smith Corporation acquired Lochinvar for $418 million, making it a wholly owned subsidiary. Today Lochinvar is headquartered at 300 Maddox-Simpson Parkway, Lebanon, Tennessee, in a 360,000 sq. ft. manufacturing and engineering facility, and manufactures residential and commercial boilers, commercial water heaters, heat pumps, pool and spa heaters, and storage tanks. Lochinvar University — based at the Lebanon, TN headquarters — is the industry's most advanced training facility for contractors, engineers, and distributors.

Lochinvar Product Lines — Units & Replacement Parts

Memphis Control Center supplies OEM parts across all major Lochinvar product families, and can source complete Lochinvar units by order. Contact us or call (901) 458-2000 with your model number, serial number, or part number.

Knight Boiler KNIGHT® Condensing Boiler — WHB, KHB Series (Wall & Floor Mount)

The Lochinvar KNIGHT is the industry-leading high-efficiency residential and light commercial condensing boiler, available in both wall-mount (WHB) and floor-mount (KHB) configurations. The current-generation KNIGHT fire tube boiler offers 95% AFUE efficiency, a fully modulating premix burner, and Lochinvar's exclusive SMART SYSTEM control with LCD display — capable of controlling up to three temperature setpoints, outdoor reset, night setback, and freeze protection. Available in 13 models from 55,000 to 399,000 BTU/hr input. Wall-mount models include an ECM variable-speed pump as standard. Direct-vent installation with PVC/CPVC or stainless vent up to 100 feet. Applications: residential hydronic heating, light commercial, schools, small hotels.

Model families: WHB (wall-mount, current generation fire tube) · KHB (floor-mount, current generation fire tube) · WBN (wall-mount, prior generation water tube — replaced by WHN series) · KBN (floor-mount, prior generation water tube)

Series	Mount	BTU/hr Input	Efficiency	Heat Exchanger
WHB (current)	Wall	55,000–399,000	95% AFUE	Fire tube · stainless steel
KHB (current)	Floor	55,000–399,000	95% AFUE	Fire tube · stainless steel
WBN/WHN (prior)	Wall	50,000–210,000	Up to 99%	Water tube · stainless steel
KBN (prior)	Floor	81,000–601,000	Up to 94.6%	Water tube · stainless steel

Complete Knight units available by order. Call (901) 458-2000 for pricing and lead time. OEM replacement parts stocked — see parts section below.

WHB · KHB (current gen) WBN · KBN (prior gen) 55K–399K BTU/hr 95% AFUE SMART SYSTEM Control Modulating Premix Burner Residential · Light Commercial

Crest Boiler CREST® Condensing Boiler — FBN Series (Commercial)

The Lochinvar CREST is a commercial condensing fire tube boiler for large commercial and institutional hydronic heating — hospitals, universities, hotels, multi-family, and district heating. The CREST features Lochinvar's exclusive wave fire-tube design, up to 96.2% thermal efficiency, and the SMART TOUCH control with CON·X·US remote monitoring. Available in models from 750,000 to 6,000,000 BTU/hr input with up to 20:1 turndown ratio. 316L stainless steel fire-tube heat exchanger. Modbus, BACnet communication capability. Outdoor models available (OF prefix).

Model	BTU/hr Input	Volume (gal)	Efficiency
FBN0751	750,000	—	Up to 96.2%
FBN1001	1,000,000	77 gal	Up to 96.2%
FBN1501	1,500,000	94 gal	Up to 96.2%
FBN2001	2,000,000	111 gal	Up to 96.2%
FBN3001	3,000,000	156 gal	Up to 96.2%
FBN5001	5,000,000	254 gal	Up to 96.2%
FBN6001	6,000,000	—	Up to 96.2%

Complete Crest units available by order — call for pricing and lead time. OEM parts stocked. FBL = LP models. OF = outdoor models.

FBN Series (natural gas) 750K–6M BTU/hr Up to 96.2% efficiency Wave Fire-Tube Design SMART TOUCH + CON·X·US 20:1 Turndown Hospitals · Universities · Hotels

ARMOR ARMOR® Condensing Commercial Water Heater — AWN, AWH Series

The Lochinvar ARMOR is a high-efficiency commercial condensing water heater with stainless steel heat exchanger technology delivering up to 99% thermal efficiency. Used in hotels, restaurants, hospitals, multi-family, gyms, and any commercial application requiring high-output domestic hot water. Features SMART TOUCH control, CON·X·US remote monitoring, and direct vent installation. The AWN series covers 150,000–800,000 BTU/hr in eight models (AWN151–AWN801). The AWH series is a separate higher-efficiency condensing variant covering 399,000–999,000 BTU/hr with efficiencies up to 99% AFUE at lower water temperatures.

Model	BTU/hr Input	AFUE	Notes
AWN151PM	150,000	96%	Condensing · direct vent
AWN200PM	199,000	96%	Condensing · direct vent
AWN286PM	285,000	96%	Condensing · direct vent
AWH0400N-PM	399,000	99%	Enhanced AFUE · pump supplied
AWH0500N-PM	500,000	99%	Enhanced AFUE · pump supplied
AWH0650NPM	650,000	98%	Pump supplied
AWH0800N-PM	800,000	98%	Pump supplied
AWH1000NPM	999,000	98%	Pump supplied

Complete ARMOR units available by order. OEM replacement parts stocked — call with model and serial number.

AWN · AWH Series 150K–999K BTU/hr Up to 99% AFUE Stainless Steel HX Hotels · Restaurants · Hospitals SMART TOUCH · CON·X·US

Copper-Fin / Power-Fin Copper-Fin II & Power-Fin Commercial Water Heaters — CWN, CFN, PFN

The Lochinvar Copper-Fin and Power-Fin are commercial atmospheric and power-vent water heaters for applications where a non-condensing design is appropriate. The Copper-Fin II (CFN series) is a direct-vent atmospheric heater with copper finned-tube heat exchanger — simple design, durable, lime scale resistant, available from 399,000 to 2,065,000 BTU/hr. The Power-Fin (PFN series) is a fan-assisted vertical copper-tube water heater for high-output applications — 500,000 to 2,000,000+ BTU/hr. The CWN series is the atmospheric Copper-Fin in the 199,000–2,065,000 BTU/hr range. Applications: restaurants, laundries, hotels, car washes, industrial washdown.

Series	Type	BTU/hr Range	HX Material
CWN	Atmospheric · spark ignition	199,000–2,065,000	Copper finned tube
CFN	Direct vent · 85% AFUE	399,000–2,065,000	Copper finned tube
PFN	Fan-assisted · vertical	500,000–2,000,000+	Copper tube

OEM replacement parts stocked for CWN, CFN, and PFN. Complete units by order — call for pricing.

CWN · CFN · PFN Series 199K–2M+ BTU/hr Copper Finned Tube HX Atmospheric & Power Vent Restaurants · Laundries · Hotels

EnergyRite EnergyRite® Pool & Spa Heater — ERN Series

The Lochinvar EnergyRite (ERN series) is a natural gas pool and spa heater for residential and light commercial applications. Available in three sizes: 150,000, 250,000, and 399,000 BTU/hr input. The EnergyRite features a copper heat exchanger, electronic ignition, and a 3-year warranty. Available in natural gas (ERN) and LP (ERL) versions. Common replacement parts: igniter, flame sensor, gas valve, pressure switch, control board, heat exchanger headers.

Model	BTU/hr Input	Fuel	Application
ERN152	150,000	Natural gas	Pool & spa · residential/light comm.
ERN252	250,000	Natural gas	Pool & spa · residential/light comm.
ERN402	399,000	Natural gas	Pool & spa · residential/light comm.

ERN Series · Natural Gas ERL Series · LP 150K–399K BTU/hr Pool & Spa · 3-Year Warranty Electronic Ignition

OEM Parts Most-Replaced Lochinvar OEM Parts — All Model Lines

Memphis Control Center stocks the most commonly replaced Lochinvar OEM parts across all product lines. Always match your model number and serial number — the same part description (e.g. "igniter") can have different Lochinvar part numbers depending on model series and production date. Call (901) 458-2000 and we'll identify the exact part number for your unit.

Part Category	Description	Common Symptoms
Hot Surface Igniter	OEM igniter / ignitor — all model lines	No ignition · lockout on startup
Flame Sensor	Flame rod / flame sense electrode	Intermittent lockout · nuisance faults
Gas Valve	Combination gas valve — model specific	No gas · lockout · pressure issues
Control Board / IFC	Integrated control / ignition module	Error codes · no display · fault lockout
Pressure Switch	Air pressure switch — model specific	Blocked flue · inducer fault codes
Combustion Blower	Inducer / combustion fan assembly	Fan fault · inducer error · noise
Temperature Sensor	Inlet/outlet/supply/return sensor	Sensor fault codes · overtemp lockout
High Limit Switch	Aquastat / high limit controller	Overheat lockout · limit tripped
Gasket Kit	Burner, HX, sight glass gasket sets	Combustion leaks · flue gas smell
Anode Rod	Sacrificial anode rod (tank models)	Tank corrosion · water discoloration
T&P Relief Valve	ASME T&P valve — 30, 50, 125, 150 PSI	Valve weeping · pressure buildup
Circulator Pump	Built-in circulator / pump assembly	No flow · pump failure codes
Burner Assembly	Premix burner / stainless mesh burner	Combustion noise · fault on ignition
Wiring Harness	Flame sense, gas valve, sensor harnesses	Intermittent faults · short circuits

Knight · Crest · Copper-Fin · ARMOR Power-Fin · EnergyRite · Shield · FTXL OEM Only — Not Aftermarket Model + Serial Required

Most-Searched Lochinvar OEM Part Numbers

These are the individual Lochinvar OEM part numbers most frequently searched by technicians and contractors. Memphis Control Center uses the Lochinvar item number as the SKU (e.g. SKU 100165937 = PLT3400 ignitor). Always confirm your model and serial number — the same part category can have different numbers across model lines and production dates. Call (901) 458-2000 if you need help matching a part to your unit.

SKU / Part #	Alt Part #	Description	Fits	Shop
100165937	PLT3400	Hot surface ignitor with gasket	Copper-Fin CB/CW/CS 495–2067; Copper-Fin II CH/CF/CP; Power-Fin PB/PF; Intelli-Fin IB/IW	Shop
100165929	PLT3021	Ignitor with gasket	Knight KB 81–286 (WBN), WB 51–211 (wall mount), KBN 399/500, ARMOR AW 150–501	Shop
100165930	PLT3022	Flame sensor with gasket	Knight KB 81–286 (WBN), WB 51–211 (wall mount), KBN 399/500, ARMOR AW 150–501	Shop
100165920	PLT30000	Ignitor with gasket — large models	Knight KBN 600–801, ARMOR AW/AWN 600–801, SB 100–1500 — direct spark	Shop
100165931	—	Flame sensor with gasket — large models	Knight KBN 600–801, SB 100–1500	Shop
100165860	PLT1151	Hot surface ignitor (replaces PLT1151 / 100326985)	TR/TA series commercial storage water heaters (TR 125–400, TA 251–401) — not Knight boilers	Shop
100208464	—	Ignition module — hot surface ignition control	Copper-Fin CB/CW 987–2067; commercial boilers and pool heaters	Shop
100233485	—	Fan / blower assembly	Knight and ARMOR boilers; Copper-Fin CB/CW 987–1257	Shop
100144992	—	Fan assembly — 115V, 60 Hz	Copper-Fin CB/CW 1437–2067	Shop
100172006	—	Gas valve assembly — 24V, 3/4" natural gas	Commercial boilers — confirm model and serial number	Shop
100167804	—	Integrated control board	ARMOR AW400 series water heaters	Shop
100167819	—	Integrated control — Knight KB 81–286 (serial H10+)	Knight KBN 081–286, serial beginning H10 and later	Shop
100167799	—	Integrated control — Knight KB 81–286 (prior to serial H10)	Knight KBN 081–286, serial prior to H10	Shop
100277718	—	Ignition electrode kit — spark igniter	Crest FBN condensing boilers	Shop
100073343	—	Flame sensor kit with gasket	Crest FBN 751–2001	Shop
GKT20050	—	Gasket set — burner, heat exchanger, sight glass	Knight WH/WHN 399 (WHL399, WHN399, WHN399PM)	Shop
100208085	—	Gasket — burner	Knight KBN 081–286 and WB series — all models	Shop
100208086	—	Gasket — ignitor	Knight KBN 081–500 and WB series — all models	Shop
100208091	—	Gasket — flame sensor	Knight KBN 081–500 and WB series — all models	Shop
ES21550468	—	Pressure switch — 2.50" W.C., diaphragm, vertical mount	Knight WHB/KHB/WBN/KBN — confirm model and serial number	Shop
100166098	—	Pressure switch	Knight KBN 081 only	Shop
100208377	—	Pressure switch	Knight KBN 106, 151, 286	Shop
100208389	—	Gas pressure switch — natural gas	Copper-Fin CB/CW 987–2067	Shop
100135311	—	Burner assembly with gasket	Knight KBN 399/500; ARMOR AWN 399/500; Shield — confirmed in Lochinvar KBX parts PDF	Shop
100073258	BNR2400K	Burner assembly — replaces BNR2400K	Copper-Fin commercial 300–750 kBTU models	Shop
100320886	—	Maintenance kit — gaskets, ignitor, flame sensor	Knight KBN 601–801 floor-mount boilers	Shop
100319589	—	Service kit — gaskets, igniter, fuse set	Power-Fin PB/PF 1501–2001	Shop
100320870	—	PM service kit — gaskets, ignitor, flame sensor	FTXL 600	Shop
100289581	CN4-2000	Condensate neutralizer kit	1–2 MBTU condensing boilers (Crest and large Knight)	Shop
100374577	CN4-850	Condensate neutralizer kit	400–850 kBTU condensing boilers and water heaters	Shop
100278131	—	Seal and bearing assembly — pump shaft	Power-Fin PF / Copper-Fin II CFII boilers	Shop
100111724	FVMX-8C	T&P relief valve — 3/4" F, 125 PSI	Lochinvar commercial water heaters — confirm model and serial	Shop
100157653	—	Cleaning service kit	Lochinvar commercial models — confirm applicability	Shop
100157628	—	Heat exchanger cleaning kit — stainless steel brushes	Knight KB/KBN 399–801, ARMOR AW 399–801, SB — per Lochinvar KBX parts PDF	Shop

Important: Always provide your model number and serial number when ordering. Many Lochinvar part numbers are updated mid-production run — the same model may use different ignitors, sensors, or control boards depending on serial number range. Don't see your part? Contact us or call (901) 458-2000.

Browse Lochinvar OEM Parts by Model Line

Browse all →

Knight WHB/KHB PartsCurrent gen fire tube boiler parts Knight WBN/KBN PartsPrior gen water tube boiler parts Crest FBN PartsCommercial fire tube boiler parts ARMOR AWN/AWH PartsCondensing water heater parts Copper-Fin CWN/CFN PartsAtmospheric water heater parts Power-Fin PFN PartsFan-assisted water heater parts EnergyRite ERN PartsPool & spa heater parts Igniters — All ModelsHot surface igniters / ignitors Flame SensorsFlame rod / sense electrodes Gas ValvesCombination gas valves — model specific Control Boards / IFCIntegrated controls & ignition modules Pressure SwitchesAir pressure switches — model specific Temperature SensorsInlet / outlet / supply / return sensors Gasket KitsBurner, HX & sight glass gasket sets T&P Relief ValvesASME T&P — 30/50/125/150 PSI All Lochinvar Parts →Browse 10,000+ Lochinvar OEM SKUs

Home
OEM Parts
Lochinvar

Compare

Show 12 24 36 48 96

Quick view

Compare

Lochinvar

SKU: 100375158

100375158

MSRP:

Was:

Price Now:

$175.81

Out of Stock
Quick view

Compare

Lochinvar

SKU: 100375157

100375157

MSRP:

Was:

Price Now:

$417.55

Out of Stock
Quick view

Compare

Lochinvar

SKU: 100375156

100375156

MSRP:

Was:

Price Now:

$218.72

Out of Stock
Quick view

Compare

Lochinvar

SKU: 100375155

100375155

MSRP:

Was:

Price Now:

$471.97

Out of Stock
Quick view

Compare

Lochinvar

SKU: 100375154

100375154

MSRP:

Was:

Price Now:

$420.69

Out of Stock
Quick view

Compare

Lochinvar

SKU: 100375153

100375153

MSRP:

Was:

Price Now:

$525.34

Out of Stock
Quick view

Compare

Lochinvar

SKU: 100375152

100375152

MSRP:

Was:

Price Now:

$525.34

Out of Stock
Quick view

Compare

Lochinvar

SKU: 100375103

100375103

MSRP:

Was:

Price Now:

$205.11

Out of Stock
Quick view

Compare

Lochinvar

SKU: 100374970

100374970

MSRP:

Was:

Price Now:

$6.28

Out of Stock
Quick view

Compare

Lochinvar

SKU: 100374969

100374969

MSRP:

Was:

Price Now:

$6.28

Out of Stock
Quick view

Compare

Lochinvar

SKU: 100374968

100374968

MSRP:

Was:

Price Now:

$1,064.29

Out of Stock
Quick view

Compare

Lochinvar

SKU: 100374602

100374602

MSRP:

Was:

Price Now:

$177.91

Out of Stock
Quick view

Compare

Lochinvar

SKU: 100374601

100374601

MSRP:

Was:

Price Now:

$175.81

Out of Stock
Quick view

Compare

Lochinvar

SKU: 100374570

100374570

MSRP:

Was:

Price Now:

$230.23

Out of Stock
Quick view

Compare

Lochinvar

SKU: 100374418

100374418

MSRP:

Was:

Price Now:

$110.93

Out of Stock
Quick view

Compare

Lochinvar

SKU: 100374417

100374417

MSRP:

Was:

Price Now:

$110.93

Out of Stock
Quick view

Compare

Lochinvar

SKU: 100374411

100374411

MSRP:

Was:

Price Now:

$2,118.12

Out of Stock
Quick view

Compare

Lochinvar

SKU: 100374405

100374405

MSRP:

Was:

Price Now:

$85.81

Out of Stock
Quick view

Compare

Lochinvar

SKU: 100374300

100374300

MSRP:

Was:

Price Now:

$385.11

Out of Stock
Quick view

Compare

Lochinvar

SKU: 100374235

100374235

MSRP:

Was:

Price Now:

$39.77

Out of Stock
Quick view

Compare

Lochinvar

SKU: 100374199

100374199

MSRP:

Was:

Price Now:

$15.70

Out of Stock
Quick view

Compare

Lochinvar

SKU: 100374198

100374198

MSRP:

Was:

Price Now:

$125.58

Out of Stock
Quick view

Compare

Lochinvar

SKU: 100374197

100374197

MSRP:

Was:

Price Now:

$264.76

Out of Stock
Quick view

Compare

Lochinvar

SKU: 100374165

100374165

MSRP:

Was:

Price Now:

$56.51

Out of Stock

Frequently Asked Questions — Lochinvar Parts & Equipment

Common questions from contractors, facilities managers, and service technicians about Lochinvar replacement parts and complete units. Contact us or call (901) 458-2000 — we'll help identify the correct OEM part for your model and serial number.

How do I find the right Lochinvar replacement part for my unit?

You need both the model number and serial number from the rating plate on your Lochinvar unit. The serial number is critical because Lochinvar has updated parts mid-production run — the same model can use different igniters, sensors, or control boards depending on manufacture date. Call (901) 458-2000 with both numbers and we'll identify the correct OEM part number.

What is the most commonly replaced part on a Lochinvar Knight boiler?

The most frequently replaced parts are hot surface igniters, flame sensors (flame rods), temperature sensors (inlet/outlet), pressure switches, and gas valves. Flame sensor degradation is the leading cause of intermittent lockouts — carbon buildup on the sensor prevents it from reading the flame signal. Igniters crack from thermal cycling. Pressure switches fail from blocked condensate traps or deteriorated diaphragms.

What is the difference between the Lochinvar Knight WHB and KHB?

The WHB is the wall-mount version of the current-generation Lochinvar Knight fire tube boiler; the KHB is the floor-mount version. Both use the same fire-tube stainless steel heat exchanger and SMART SYSTEM control, and both achieve 95% AFUE in models from 55,000 to 399,000 BTU/hr input. The WHB includes an ECM variable-speed pump as standard. The KHB is free-standing and better suited when wall mounting is not practical.

What replaced the Lochinvar Knight WBN water tube boiler?

The WBN series (water tube, wall-mount) was replaced by the WHN and then the current WHB series (fire tube, wall-mount). The KBN series (water tube, floor-mount) was replaced by the current KHB series. The current-generation Knight uses a fire-tube stainless steel heat exchanger rather than the earlier water tube design. OEM replacement parts for WBN and KBN units are still available through Memphis Control Center.

What is the difference between the Lochinvar Crest and Knight?

The Knight (55,000–399,000 BTU/hr) is designed for residential and light commercial hydronic heating. The Crest (750,000–6,000,000 BTU/hr) is a commercial condensing fire tube boiler for hospitals, universities, hotels, and large commercial buildings. The Crest uses Lochinvar's proprietary wave fire-tube heat exchanger, SMART TOUCH control with CON·X·US remote monitoring, up to 96.2% efficiency, and up to 20:1 turndown ratio.

What is the difference between the Lochinvar ARMOR and Copper-Fin commercial water heaters?

The ARMOR (AWN/AWH) is a condensing commercial water heater with a stainless steel heat exchanger — up to 99% thermal efficiency through flue gas heat recovery, requiring direct vent installation. The Copper-Fin (CWN/CFN) is an atmospheric or direct-vent non-condensing water heater with copper finned-tube heat exchanger — simpler design, lower first cost, typically 80–85% efficiency. ARMOR is best when operating cost savings are the priority; Copper-Fin when first cost, simplicity, or venting constraints favor a non-condensing design.

Does Memphis Control Center sell complete Lochinvar units, not just parts?

Yes. While OEM replacement parts are our primary Lochinvar business, we can source complete Lochinvar units — Knight boilers, Crest commercial boilers, ARMOR water heaters, Copper-Fin water heaters, EnergyRite pool heaters, and more. Call (901) 458-2000 for availability, pricing, and lead time. As a CGNA Elite Distributor, we access a national network of inventory beyond what is listed on our site.

What does SMART SYSTEM mean on a Lochinvar boiler?

SMART SYSTEM is Lochinvar's proprietary integrated operating control on Knight boilers — LCD display, control of up to three temperature setpoints, outdoor reset, night setback, freeze protection, modulating burner control, and diagnostic fault codes. SMART TOUCH is the commercial version on Crest boilers and ARMOR water heaters, adding CON·X·US remote monitoring via Ethernet or cellular and Modbus/BACnet communication for building automation integration.

Who manufactures Lochinvar and where?

Lochinvar, LLC was founded in 1939 and acquired by A.O. Smith Corporation (NYSE: AOS) in August 2011 for $418 million. Lochinvar operates as a wholly owned A.O. Smith subsidiary, headquartered and manufactured at 300 Maddox-Simpson Parkway, Lebanon, Tennessee in a 360,000 sq. ft. facility. A.O. Smith is one of the world's largest water heater manufacturers. Lochinvar specializes in high-efficiency boilers, commercial water heaters, heat pumps, pool and spa heaters, and storage tanks — sold exclusively through the professional plumbing and heating contractor channel.

Need a Lochinvar Part or Unit?

Have your model number and serial number ready. We'll identify the exact OEM part number and confirm availability — same-day shipping on stocked parts from Memphis, TN.

Call (901) 458-2000 Browse All Lochinvar Parts Request a Quote

For emergencies, outside of business hours, call #901-604-7069