Judith,
Have a look at this link. It can be used with a iron tank, to make a heater for swimming pools and hot tubs.
http://diysolar.dasolar.com/group/diyfresnellense
Good luck.
Ray
From: JUDITH WILLIAMS <williams_judith@hotmail.com>
To: organic_architecture@yahoogroups.com; papercreters papercreters <papercreters@yahoogroups.com>
Sent: Wed, November 10, 2010 8:31:37 AM
Subject: [papercreters] On demand water heater
Have a look at this link. It can be used with a iron tank, to make a heater for swimming pools and hot tubs.
http://diysolar.dasolar.com/group/diyfresnellense
Good luck.
Ray
From: JUDITH WILLIAMS <williams_judith@hotmail.com>
To: organic_architecture@yahoogroups.com; papercreters papercreters <papercreters@yahoogroups.com>
Sent: Wed, November 10, 2010 8:31:37 AM
Subject: [papercreters] On demand water heater
Has anyone used an on demand water heater to heat a hot tub? Would this be wildly impractical? I would love to have an outdoor water feature where I could soak but am not up to figuring out solar or anything like that.
The Making of Papercrete DVD now available on Amazon.com
http://www.amazon.com/Making-Papercrete-Judith-Williams/dp/B0040ZNE9A/ref=sr_1_1?ie=UTF8&s=dvd&qid=1283998627&sr=8-1
Follow progress on the new project at http://www.papercretebyjudith.com/blog
More papercrete info at http://squidoo.com/papercretebyjudith
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