Heatmaker – Heating-Only Type Boilers, such as Models H, EDP (Endurance), CB, and HWG (9600 Series) and Summit Boilers
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This series has no built-in storage tank and requires a flow-limiting thermostat as its flow (supply). This limits the minimum temperature of the boiler to 150-160 degrees F and prevents the cold system return from creating condensation on the copper fin coils that would eventually foul them.
Note: Make sure that the boiler pump has been checked and is functioning properly.
- H and EDP models have an automotive type thermostat located in a black ips-type union installed in the supply-to-system piping no more that 2 feet from the boiler
- The 9600 series and Summits have a built-in thermostat accessible via a removable plate on the top jacket.
In normal operation upon ignition, boiler temp rises quickly to 150 to 160 degrees F and then settles there until the return temperature starts to rise.
- Type A: The thermostat is stuck in the open position. The temperature rise upon ignition is very slow until returns start to heat-up.
- Type B: The thermostat fails to open. The temperature rises rapidly and the unit shuts down on its limit.
Replacement Thermostat Part Numbers:
Models H and EDP: 2400-030
Models CB and HWG, pre-1995: 2400-129
Models CB, HWG and Summit, post-1995: 2400-130
If you have any questions, call Heatmaker’s technicians Monday-Friday, 5:00 a.m. – 7:00 p.m., EST; and Saturday 5:00 a.m. – 1:00 p.m., EST.
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