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High efficiency boilers were introduced in response to the energy crisis of the seventies. Most first generation high efficiency boilers were simply standard units that had been hurriedly modified to boost efficiency. These boilers obtained higher efficiencies by permitting steady-state condensation in the heat exchanger and in the combustion chamber. Failure to adequately protect the combustion chamber and heat exchanger from the corrosive effects of condensate meant that most first generation units failed prematurely. The units condensed, eventually corroded, and finally were discarded. Manufacturers learned from their mistakes. They upgraded materials, redesigned heat exchangers and refined their manufacturing techniques. The second generation of high efficiency boilers, which began to appear in the late eighties, was a vast improvement. However, second generation units still experience damage from condensation. Although the materials used in second generation high efficiency boilers last considerably longer, they still eventually succumb to corrosion.
Raypak ADB H4-0751
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Raypak ADB 008794F Manifold-Gas Injector Nat Lower Raypak ADB 008826F Orifice Pilot Nat Raypak ADB 007196F Valve Pilot Gas Nat
Raypak 008794F GAS INJECTOR MANIFOLD NAT LOWER 750A-KIT, ADB751, Mfg 2005 Raypak 008826F PILOT ORIFICE NAT750A-1500-KIT, ADB751, Mfg 2005 Raypak 007196F VALVE PILOT GAS NATADB-KIT, ADB751, Mfg 2005
Raypak ADB 008860F Manifold-Gas Injector Nat Upper Raypak ADB 004079F Flow Switch Paddle Raypak XTherm 007142F Flow Switch
Raypak 008860F GAS INJECTOR MANIFOLD NAT 750A-KIT, ADB751, Mfg 2005 RAYPAK 004079F FLOW SWITCH PADDLE-KIT RAYPAK 007142F FLOW SWITCH-KIT
Raypak XTherm 007144F Manual Reset Adjustible High Limit 240F Raypak Raythem 007189F Manual in.A in. Valve 1 in. [Tb] Raypak Raythem 007195F Manual in.B in. Valve 1/8 in. [TIPR]
RAYPAK 007144F HIGH LIMIT 100-240F MANUAL RESET-KIT RAYPAK 007189F VALVE GAS MANUAL A1"-KIT RAYPAK 007195F VALVE GAS MANUAL B-KIT
Raypak Commercial RayTherm 007211F Sensor Well Raypak ADB 007922F Igniter-Spark Rod Raypak ADB 008081F Manual Reset High Limit 200
RAYPAK 007211F BULB SENSOR WELL-KIT RAYPAK 007922F IGNITER SPARK ROD750A-1500-KIT RAYPAK 008081F HIGH LIMIT 100-200F MANUAL RESET-KIT
Raypak ADB 007141F Auto Reset High Limit 240 Raypak Commercial 006035F Flame Roll-Out Sensor Raypak MVB 006872F Rocker Switch (Burner / Pump)
Raypak 007141F High Limit 100-240F Auto Reset Kit Raypak 006035F Temp Sensor 300F Kit Raypak 006872F Rocker Switch SPST Kit
Raypak MVB 007222F PRV 60 PSI Raypak MVB 007225F PRV 150 PSI Raypak MVB 007158F Air Vent Pressure Switch
Raypak 007222F Pressure Relief Valve 60 PSI Raypak 007225F Pressure Relief Valve 150 PSI Raypak 007158F Pressure Switch Vent NC 302-2342, 500-1000 KIT
Raypak Hi Delta 007148F Remote Aquastat (Tankstat)(B-2) Raypak ADB 006445F Controller On/Off B-20 Raypak B (BOOSTER) 005755F Silicone Rubber Sealant (10oz)
Raypak 007148F Aquastat Controller Tank Raypak 006445F High Limit 40-180F Auto Reset Raypak 005755F Z-11 Silicone Tube 10 oz
Raypak MVB 007157F Control PC Board (LWCO) Raypak XTherm 005641F Test / Reset Switch (LWCO) Raypak MVB 007228F Remote Sensor (LWCO)
Raypak 007157F PC Board Control LWCO Raypak 005641F Alarm Reset Switch Raypak 007228F Remote Sensor LWCO
Raypak Hi Delta 011912F PRV 125 PSI Raypak ADB 007187F Switch Low Gas Pressure Raypak ADB 007188F Switch High Gas Pressure (optional) Not Shown
125 PSI, 3/4" m, PRV Raypak 007187F Pressure Switch Gas Low-Kit Raypak 007188F Pressure Switch Gas High-Kit
Raypak XTherm 007392F Remote Aquastat (Tankstat) 2-Stage B-3 Raypak MVB 008924F RTV Sealant 2.8 oz (Not Shown) Raypak MVB 006947F Window Combustion Chamber
Raypak 007392F B3 Tank Aquastat Control-Kit Raypak 008924F Silicone Rubber Sealant 2.8 oz - Kit Raypak 006947F Inspection Window ADB/MVB-Kit
Raypak ADB 004093F Auto On/Off Valve 1 in. (V-88) Raypak Raythem 004095F Auto On/Off Valve 1-1/2 in. [TIP] Raypak Commercial RayTherm 006536F Drain Valve
Raypak 004093F Combination Gas Valve Nat. 1" [T, TC, TD, WT, THWS] Raypak 004095F Auto On/Off Valve 1-1/2" (V-88) Raypak 006536F Drain Valve
Raypak ADB 007146F Printed Circuit Board - Central Point Wiring Raypak ADB 007156F Ignition Control IID Raypak ADB 007163F Switch-Pressure Air Normally Open
Raypak 007146F Printed Circuit Board - Central Point Wiring Single Try Spark Ignition Control IID Raypak 007163F Switch-Pressure Air Normally Open
Raypak MVB 007204F Return Header Bronze Raypak MVB 007241F Insulation Blanket Return Header Raypak MVB 007257F Return Header Cover
Raypak ADB MVB XTherm 007241F Insulation Blanket Return Header
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Raypak 007204F Return Header Bronze Raypak 007241F Blanket Return Header Refractory Raypak 007257F Return Header Cover
Raypak CHX (Condensing Heat Exchanger) 007343F Header Gasket Kit Raypak ADB 007923F Pilot Burner (not shown) Raypak ADB 007925F Relay DPST 24 VAC
Raypak 007343F Header Gasket (20 PCS) Raypak 007923F Pilot Burner (not shown) Raypak 007925F Relay DPDT 24 VAC
Raypak Raythem 007933F Manual in.A in. Valve 1-l/2 in. [Tb] Raypak ADB 008667F Time Delay Contactor Raypak ADB 009104F Studbolt
Raypak 007933F Valve Gas Manual A 1-1/2" Raypak 008667F Time Delay Contactor Raypak 009104F Studbolt