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Alan(CaliforniaRadiant)Forbes
Alan(CaliforniaRadiant)Forbes Member Posts: 1,243
in THE MAIN WALL
from architects, builders and homeowners:

"I have a small (450 [])addition that I want to heat with radiators; can we use the existing Takagi "flash" domestic water heater and a heat exchanger as the heat source for the radiators?"

For various reasons, radiant floors and/or walls are not options at this point.

My fear is cranking the Takagi up to 180° may scald someone (tempering valve failure). And even at 180°, you're only going to get 150-160° on the secondary side of the heat exchanger; just means bigger radiators.

Any of you guys do this regularly?



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  • hr
    hr Member Posts: 6,106
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    You could

    turn that low mass low water content into a large water content heater. Add a Thermox indirect which carries boiler water in the tank and supplies the DHW with the coils.

    Although I know in some of your areas double wall HX's are required??


    This way you would lower the dhw temperature a bit and give you a nice buffer capacity, to minimize short cycling with a small, mild day loads on the heating side.

    I use the Sparco thermostatic (scald guard)and they, like many others, always fail to the cold side. Scalding should not be an issue.

    Will the Takagi run up to 180°? Some of those small instantanous types limit out at 140 or 160°.

    hot rod

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