Winterizing hot water heating sysems

Discussion in 'Boiler Forum' started by TJay, Sep 20, 2011.

  1. TJay

    TJay New Member

    Sep 20, 2011
    General question about winterizing plumbing in homes that have a hot water heating system (any type of hot water boiler or geothermal system for hot water baseboard or radiant floor heat). I most commonly see Weil McLain boilers, though newer direct vent systems are showing up such as Lochinvar and others. Though I realize that hot water boiler systems can be drained and winterized, I am asking about a scenario where the household plumbing is winterized, but the hot water heat system is not. For example, HUD/Fannie Mae and others direct property managers to drain and winterize plumbing, but leave heat on (at a low setting).

    Almost any heating system I have seen that circulates hot water for heat will have a make-up water supply line from the plumbing system.

    Question is: How much water do most hot water heat systems actually draw from the make-up water supply? If the plumbing water supply is completely shut down, say for a 6 month period, and the hot water heating system left running (at a low temp), will the hot water heating system be starved for make-up water? Is it different if there is, or is not, an anti-freeze solution mix in the heating loop?
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