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Posted by dana on November 24, 2008 at 16:08:48:
In Reply to: Re: Takagi KD20 vs. T-K3 as hydronic boiler posted by badgerboilerMN on November 13, 2008 at 19:26:10:
: Water heaters are not designed for space heating.
Both of these models are rated & recommended for space heating use by Takagi. Takagi encourages space heating applications in the product documentation (unlike most other on-demand manufacturers, who may void the warranty.) Lots o' peops are USING them as hydronic boiler:
I'm not too concerned. They're little more than smallish wall-hung modulating copper-tube boilers with a few peculiarities. If the system is designed to accommodate those characteristics there doesn't seem to be much reason NOT to use 'em as boilers. They have some nice aspects over their cast-iron cousins: Inherent condensing-temperature tolerant, can be programmed to be essentially "right sized" for the load, with combustion efficiencies in the mid-80s even when not fully modulating, etc. But they're not as bulletproof as cast-iron I suppose...
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