[Strawbale] Radiator heating (off list repost)

[Alan Mason]

Thank you everyone for your great input. We are now reconsidering the idea
of going tankless for the radiators. The high efficiency brand of
conventional water heater I am most familiar with is Polaris, but they are
quite pricey. Can anyone recommend another brand and/or point me to the
website that has the best prices for the Polaris?

Thanks again.

@

----- Original Message ----- 
From: "Shody Ryon" <qi4u at yahoo.com>
To: <strawbale at listserv.repp.org>
Sent: Sunday, April 22, 2007 8:19 PM
Subject: Re: [Strawbale] Radiator heating (off list repost)


> I was comparing a 85,000 BTU (the smallest they
> presently make) natural gas Takagi tank less to a
> $2500 condenser power vent natural gas water heater, I
> forget the brand, but when looking at the percentage
> of efficiency, which is number value, and the
> condenser water heater had a 2% higher rating of
> converting gas to hot water. This does not include the
> cost of maintaining a higher than ambient temperature
> in a tank over time, which would mean that if all the
> occupants do not use domestic hot water for several of
> the same hours, even with the lower efficiency, not
> keeping the tank warm would more than compensate,
> saving energy and money. So it depends on the schedule
> of the demand for hot water. If people are using small
> to moderate amounts of hot water often through out the
> day and night, I would think the condenser tank water
> heater would use less energy, especially if additional
> insulation was (safely, be careful about fires) used
> with the tank.
> I was also thinking about thermal mass as related to
> the hydronic systems. If high mass thermal storage is
> used that is insulated from the living space, such as
> under a layer of insulation under the floor (so heat
> is not coming into the floor from the storage
> directly) then low mass exposed to the living space
> could be an advantage. It could add the ability to
> change the temperature (relatively) quickly, if that
> is desired. It would also take less energy to change
> temperature.
>
> Cheers
> Shody
> --- Mark Frazier <fritter63 at charter.net> wrote:
>
> > Well, except for the gas tankless heaters...
> >
> > On Apr 22, 2007, at 3:37 PM, Shody Ryon wrote:
> >
> > > as far as I can tell, a good gas water heater is
> > more
> > > effient than most/all tankless water heaters,
> > > percentage wise.
> >
>
>
>
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