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Rick, HVAC Supervisor
Category: HVAC
Satisfied Customers: 21552
Experience:  40+ yrs. experience as a licensed oil & gas technician.
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I have a Weil-Mc Lain Gas Fired Boiler in my house. Model

Customer Question

I have a Weil-Mc Lain Gas Fired Boiler in my house. Model CG7 SPDN (series 12) input BTU 210,000.
The heating system has
- Two zones for radiant heat.
- One Zone for hot water tank.
- Four zones for baseboard heating.
If none of the (7) zones are calling for heat, should the boiler cycle off and on to maintain a specific hot water temperature range in the boiler ie 150 F- on 185 F off??
It does not currently maintain a hot water temp range in the boiler. If none of the zones call for heat, the boiler does not come on and the water cools down.
Submitted: 1 year ago.
Category: HVAC
Expert:  Rick replied 1 year ago.

The only time a boiler maintains water temp is if you have a DHW (domestic hot water) coil in the boiler. Since this apparently isn't the case here there is no point in maintaining a hot boiler and it's a big waste of gas anyway.