[Greenbuilding] HEAT PUMP WATER HEATER

[Alan Abrams]

On Tue, Oct 2, 2012 at 5:56 PM, christian corson <chris at ecocor.us> wrote:

>
> No it doesnt. The ASHPWH will actually increase the heating demand
> considerably when running in the shoulder and heating seasons.
> My experiences with Stiebel Eltron is that they can actually decrease the
> temp by as much as 6 degrees depending on the space (assuming 800ft2 if you
> are not using make up air). Graham Wright did some work with this relative
> to PH specifically a few years ago. I believe that in his study it
> increased the heating demand by as much a 2/KBTUFT2YR or something like
> that (off the cuff metrics). Although I have installed them up here in
> Maine they have been outside of the thermal envelope and their primary use
> was for summer only residents who were offsetting with PV. For your climate
> why dont you just use an ASHP and run it in dehumdification mode (slight
> cooling) in the shoulder seasons.  For DHW why not LPG? You could bury the
> tank or not depending on the codes there.
>
>
> Christian--that's not the answer I anticipated, but it sounds like the one
I needed to hear.  Thanks--

AA
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