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tank -> tankless

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Posted by Power Cat on April 19, 2004, 11:51 pm
Folks the subject of solar -> unpowered tank -> tankless water heater
has been discussed here several times -- please humor me if I ask one
question:  if I want to switch to a passive unpowered tank which dumps
to a tankless water heater, does anyone know a brand of massively
insulated ~50 gallon or so sized tanks?

One could just depower an existing hot water heater but these
generally have only an inch or two of insulation.  Maybe that's OK but
is there a "better" option?

Thanks for any responses.

Posted by Anthony Matonak on April 20, 2004, 4:25 am
Power Cat wrote:

I don't know if there is a better option short of building your own
tanks. After all, an electric water heater is simply an insulated tank
with heater elements plugged into it. Get one without the heater part
inserted yet and you have just a tank. The thin insulation can be
supplemented by wrapping it with as much insulation as you like.
Fiberglass seems to be the popular choice and is somewhat affordable.


Posted by Glenn on April 20, 2004, 3:28 pm
 Rheem/Ruud make a "solar tank" contact a plumbing dealer and brace for
sticker shock :-( since they're not a high demand item.

Plan B http://www.solarthermal.com/  sells a stainless tank (lasts
forever and costs like it too)

Plan C Take common inexpensive electric tank and superinsulate it

I am going plan C myself, and if I can find a safe way to flame-proof
styrofoam chips I'll be insulating it very cheap.

I know some tanklesses are better than others at coping with preheated
water, investigate carefully ...

Good luck, Glenn

Power Cat wrote:

Posted by Ecnerwal on April 20, 2004, 4:13 pm

Either cement or drywall compound should work nicely.

Cats, Coffee, Chocolate...vices to live by

Posted by repairco on April 26, 2004, 7:29 am
 If you are talking about the Styrofoam packing that looks like slices off a
ping pong ball I would urge you to reconsider.  A neighbor had 3 very
expensive parrots die, probably from the outgassing of the packing peanut
foam he used to super-insulate his heated water storage tank.
He installed the tank but left it dry for several days and the birds showed
no sign of distress but within about 36 hours of his transferring the hot
water from his old tank to the new one they all croaked.
The tank was located in a basement area about 30' away from the birds and at
a lower level.
I'd stick with fiberglass or ceramic wool myself.


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