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Posted by on October 22, 2009, 2:03 pm
I'd like to put in a hot-water pre-heater.
ie; a coil of black plastic pipe on the roof.
It would go between the cold water source,
and the cold-water inlet to the water heater.
No controls, no relays, no housings, no...anything.
On warm sunny days ( 99% of the time )
it would pre-heat the water going into the water heater.
My question is;
What type of flexible black plastic pipe
would hold up to the sun without degrading ?
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Posted by hallerb@aol.com on October 22, 2009, 2:16 pm
> I'd like to put in a hot-water pre-heater.
> ie; =EF=BF=BDa coil of black plastic pipe on the roof.
> It would go between the cold water source,
> and the cold-water inlet to the water heater.
> No controls, no relays, no housings, no...anything.
> On warm sunny days ( 99% of the time )
> it would pre-heat the water going into the water heater.
> My question is;
> What type of flexible black plastic pipe
> would hold up to the sun without degrading ?
if you look at how much water you will be heating its a fiancial loser
as described. not enough water will be heated.
payback 25 years
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Posted by ransley on October 22, 2009, 3:28 pm
> > I'd like to put in a hot-water pre-heater.
> > ie; a coil of black plastic pipe on the roof.
> > It would go between the cold water source,
> > and the cold-water inlet to the water heater.
> > No controls, no relays, no housings, no...anything.
> > On warm sunny days ( 99% of the time )
> > it would pre-heat the water going into the water heater.
> > My question is;
> > What type of flexible black plastic pipe
> > would hold up to the sun without degrading ?
> if you look at how much water you will be heating its a fiancial loser
> as described. not enough water will be heated.
> payback 25 years
With enough pipe, and diy? I was in mexico, everyone had black
plastic water tanks on the roof and 5 gallon tank water heaters, if
the tank didnt work the water was still hot enough to take a quick
shower. Plastic pipe and tanks are dirt cheap, but you still done
believe in tankless and you havnt owned one.
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Posted by Jules on October 22, 2009, 4:41 pm
On Thu, 22 Oct 2009 11:16:55 -0700, hallerb@aol.com wrote:
>> I'd like to put in a hot-water pre-heater.
>> ie; �a coil of black plastic pipe on the roof.
>> It would go between the cold water source,
>> and the cold-water inlet to the water heater.
>> No controls, no relays, no housings, no...anything.
>> On warm sunny days ( 99% of the time )
>> it would pre-heat the water going into the water heater.
>> My question is;
>> What type of flexible black plastic pipe
>> would hold up to the sun without degrading ?
>
> if you look at how much water you will be heating its a fiancial loser
> as described. not enough water will be heated.
Yeah, I looked at it a while ago and the length of pipe needed to equate
to a 50 gallon tank is considerable. But having said that, *if* pipe can
be found cheap enough somewhere then maybe...
My main concern wouldn't be degradation, but whether anything that made
financial sense was also suitable for domestic water and wasn't going to
leech something nasty into the supply...
> payback 25 years
Well, that depends on location, materials cost, typical inlet water
temperature etc. (ours sits at an average of about 50F, but I don't know
how typical that is)
cheers
Jules
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Posted by ROANIN on October 23, 2009, 11:41 pm
> On Thu, 22 Oct 2009 11:16:55 -0700, hallerb@aol.com wrote:
>>> I'd like to put in a hot-water pre-heater.
>>> ie; ?a coil of black plastic pipe on the roof.
>>> It would go between the cold water source,
>>> and the cold-water inlet to the water heater.
>>> No controls, no relays, no housings, no...anything.
>>> On warm sunny days ( 99% of the time )
>>> it would pre-heat the water going into the water heater.
>>> My question is;
>>> What type of flexible black plastic pipe
>>> would hold up to the sun without degrading ?
>> if you look at how much water you will be heating its a fiancial loser
>> as described. not enough water will be heated.
> Yeah, I looked at it a while ago and the length of pipe needed to equate
> to a 50 gallon tank is considerable. But having said that, *if* pipe can
> be found cheap enough somewhere then maybe...
> My main concern wouldn't be degradation, but whether anything that made
> financial sense was also suitable for domestic water and wasn't going to
> leech something nasty into the supply...
>> payback 25 years
> Well, that depends on location, materials cost, typical inlet water
> temperature etc. (ours sits at an average of about 50F, but I don't know
> how typical that is)
> cheers
> Jules
When I was in college in 1975, I build a solar water heater. It used a
thermosiphon principle. As I was living in a house trailer at the time, the
hot water would rise into the small water heater in the trailer and push the
cold water out the bottom of the inside heater into the solar insulated box
that was outside, lower than the trailer. Inside the insulated 4 x 8 box,
was 500 feet of coiled black plastic hose. it worked real good for most of
the summer. Even on a cloudy day I would get very hot water out of it. Alas,
though, my design had a flaw, and the coil got a kink in it and one day it
sprung a leak. My wife shut off the water, and by the time I got home a
couple hours later, all I had left was a giant blob of melted plastic.
Needless to say, future ones I dabbled with were made of materials that
would not kink.
Roanin
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> ie; =EF=BF=BDa coil of black plastic pipe on the roof.
> It would go between the cold water source,
> and the cold-water inlet to the water heater.
> No controls, no relays, no housings, no...anything.
> On warm sunny days ( 99% of the time )
> it would pre-heat the water going into the water heater.
> My question is;
> What type of flexible black plastic pipe
> would hold up to the sun without degrading ?