Herbert Graf wrote:
> The main theory on "save energy" is that fact that you don't have a
> tank of hot water that has to be kept hot all the time.

Right, but insulation for that is relatively cheap and easy.  On the flip
side, the heat exchanger coil in the heater also looses heat and eventually
the heater will fire, bring the coil to the maximum temperature, then turn
off again.  I can occasionally hear my heater firing for a minute or so whe=
n
I know nothing should have been using hot water and the house heat is not
on.  It's infrequent enough that I suspect it amounts to a very small
fraction of overall oil usage, but it's still due to heat loss like a tank
system.

Of course the whole heater is insulated too, but I would guess that it is
more expensive to do that to get to the same level of power loss.


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