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Old 10-10-2010, 08:08 AM   #16
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Go for it! Drain Water Heat Recovery

Yuri, I respect your opinion immensely, however in this case I will vote against you.
RS I have installed several Power Pipes, made here in Waterloo, and have and installer pricing option as well.
There may be some government grants still available if you have done an Eco Energy audit.
The "pipes" splice into your 4" drain stack and tap into your supply before the water heater. The coil is outside. The big energy gain here is a home with back to back showers as BT says. I have 3 boys taking long showers 20 minutes on average, so 5 people showering back to back daily sometimes 2 showers running at once. There would be minimal gain from a bath tub, dishwasher or laundry, but since installing this device,(a year later than my HE furnace so I have some history with the gas bill ,) my gas bill is reduced further again.

Yes it will be a long term payback, I estimate 4-5 years but these boys will still be showering at home maybe more once they are dating. We NEVER run low on hot water and it is free energy and there is no reduction in water flow even with low flow shower heads.

My install took less than 1.5 hours as my stack and supply were within 4 feet of each other and I used Shark Bites to speed up the process due to a slightly leaky city shut off valve. There was no sludge in the 35 year old ABS drain stack I cut out however the copper I installed my react differently....

IF you want more info send me a PM I can give you some specifics


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Old 10-10-2010, 08:29 AM   #17
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With that amount of hw usage you really need one of these:

Heat exchangers like geo-thermal systems sound great but only time and heavy use like yours may payoff.
"Cut it twice and it is still too short".
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Old 10-10-2010, 02:26 PM   #18
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Agree that could be an option but the existing heater is working well and still under warranty so I think the break even on that baby is very long term, Meanwhile the Power Pipe will still work in conjunction with the tankless if I go that route in future, but to a lesser degree of savings.


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