[Strawbale] Radiator heating (off list repost)

[John Swearingen]

We have frequently installed systems with both Takagi and Bosch tankless
heater used as boilers in conjunction with large water storage tanks and a
pump loop.  When the water in the storage cools, the pump is activated and
runs water through the heater until it's back up to temperature.  With a
heating coil, and/or temperature reduction valve, we can use this same
heater for domestic water.

These are very common systems, and we've had good results with them.  The
Takagi offers a "plug and play" unit which has most of the controls needed.

John

On 4/22/07, Shody Ryon <qi4u at yahoo.com> wrote:
>
> as far as I can tell, a good gas water heater is more
> effient than most/all tankless water heaters,
> percentage wise.
> A new area of specialty for lawyaers is in prosecuting
> people (companies or rich people, I would guess) who
> install open loop hydronic heat systems.
> Water becomes stale and is said to vector legionare's
> disease.
> Closed loop systems can have a single source of heat
> if the water is kept isolated and the heaters are
> indirect heater with hot water storage.
> I would say that the only advantage of a tankless
> heater in a hydronic system would be if the occupants
> had a regular schedule that kept all of the occupants
> out of the house several hours. This would be a low
> volume thermal storage system (no tank); the lower the
> better, with a timer that heated the system for a part
> of the time and that was not heating for a long enough
> time to save on energy.
>
> It would seems that we have both come to the same
> conclution.
> Shody
>
>
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-- 
John Swearingen
Skillful Means, Inc.
Design and Construction
www.skillful-means.com