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McDonnell Miller WFE-24V - UNIMATCH FEEDER - Oswald SupplyMcDonnell Miller WFE-24V - UNIMATCH FEEDER - Oswald Supply
McDonnell Miller WFE-120 - UNIMATCH FEEDER - Oswald SupplyMcDonnell Miller WFE-120 - UNIMATCH FEEDER - Oswald Supply
McDonnell Miller TC-4 - TEST & CHECK PACKAGE - Oswald SupplyMcDonnell Miller TC-4 - TEST & CHECK PACKAGE - Oswald Supply
McDonnell Miller 157S-RL-M - HI PRESSURE LEVEL CONTROL - Oswald Supply
McDonnell Miller 157S - HI PRESSURE LEVEL CONTROL - Oswald SupplyMcDonnell Miller 157S - HI PRESSURE LEVEL CONTROL - Oswald Supply
McDonnell Miller 150S-M - HI PRESSURE LEVEL CONTROL - Oswald SupplyMcDonnell Miller 150S-M - HI PRESSURE LEVEL CONTROL - Oswald Supply
McDonnell Miller 150S - HI PRESSURE LEVEL CONTROL - Oswald SupplyMcDonnell Miller 150S - HI PRESSURE LEVEL CONTROL - Oswald Supply
McDonnell Miller 67 - LOW WATER CUT-OFF - Oswald SupplyMcDonnell Miller 67 - LOW WATER CUT-OFF - Oswald Supply
McDonnell Miller 64A - LOW WATER CUT-OFF - Oswald Supply
McDonnell Miller 63M - LOW WATER CUT-OFF - Oswald SupplyMcDonnell Miller 63M - LOW WATER CUT-OFF - Oswald Supply
McDonnell Miller 63 - LOW WATER CUT-OFF - Oswald SupplyMcDonnell Miller 63 - LOW WATER CUT-OFF - Oswald Supply
McDonnell Miller 61 - LOW WATER CUT-OFF - Oswald SupplyMcDonnell Miller 61 - LOW WATER CUT-OFF - Oswald Supply
McDonnell Miller 51-2 - WATER FEEDER LWCO - Oswald SupplyMcDonnell Miller 51-2 - WATER FEEDER LWCO - Oswald Supply
McDonnell Miller 51 - WATER FEEDER - Oswald Supply
McDonnell Miller 47-2 - WATER FEEDER LWCO - Oswald SupplyMcDonnell Miller 47-2 - WATER FEEDER LWCO - Oswald Supply
McDonnell Miller 47 - WATER FEEDER - Oswald SupplyMcDonnell Miller 47 - WATER FEEDER - Oswald Supply
McDonnell Miller 25A - MAKE-UP WATER FEEDER - Oswald SupplyMcDonnell Miller 25A - MAKE-UP WATER FEEDER
Hydrolevel VXT Feed Valve Service Kit - # 45-345 - Oswald SupplyHydrolevel VXT Feed Valve Service Kit - # 45-345 - Oswald Supply
Hydrolevel HYDROSTAT IC 4200AXL - Oswald Supply

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Boiler Heating Supplies Controls FAQs

Boiler controls include thermostats, transformers, control boards, low water cut-offs, safety valves, and circulator pumps that regulate and protect the heating system.

A low water cut-off shuts down the boiler's burner if the water level drops too low, protecting the boiler from operating dry and overheating.

Yes. Replacement Argo parts such as control boards, transformers, and wire kits are available for electric boiler systems.

Manufacturers typically recommend testing safety and relief valves at least once a year to confirm they release pressure properly. Always check with manufacturer safety guidelines.