[Strawbale] Radiator heating (off list repost)

[Shody Ryon]

Interesting!
this brings back (David's and?) my question; if a
condeser water heater has a higher effciency rating
than a tankless Takgi, why add a tank to to a less
effcient tankless heater?
Shody
--- John Swearingen <john.skillfulmeans at gmail.com>
wrote:

> 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
> 


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