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This useful energy-saving device uses a wrap-around heat exchanger to recover heat from waste water pipes (from baths, showers, washing up, etc), and transfer this heat into water input to a boiler or air input to a furnace.

What to look for

You will need to inspect your waste water pipe(s)--or have a qualified plumber do so--to determine the length of pipe available, and the diameter of pipe. (There is normally no benefit in surrounding more than a 60inch length of pipe with WWHR tube.)

Criteria