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Takagi KD20 vs. T-K3 as hydronic boiler

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Posted by dana on October 01, 2008 at 17:18:40:

Used as a boiler (in conjunction with a buffer tank like an ErgoMax), will the KD20 output temp to 176F perform comparably to the T-K3 set to either 150F or 176F out, (maintaining the tank at 140F)?

The T-K3 can modulate down to about ~9kbtuh out vs. a low of ~16.5kbtuh out for the KD20, but if I run a crude cycling-loss model against my anticipated binned-hourly load it would seem there's only a ~0.6% difference average efficiency. (OK, so I'm an enginerd- can't leave it alone... :-) )

Seems right to me, but is it? (HeatPro? Anyone?)

(I need sealed combustion in my ever tighter house, and price wise when all the adaptor kits are added up with the T-K3 it looks like I could spend less money going with the KD20.)

Caveats?

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