The Power-Pipe® Drain Water Heat Recovery (DWHR) System is a patent-pending heat exchanger that recovers heat energy from drain water and reuses it to reduce your energy consumption and its associated costs. As fresh water flows up through the Power-Pipe®''s multiple fresh water coils, warm to hot drain water runs down the inner drainpipe as a "falling film". The drain water heat is readily transferred to the incoming cold water, raising its temperature before it flows into your house plumbing system.

The Power-Pipe is a simple, proven way to save up to 40% of the water heating costs in a typical home. Built of quality materials and with no moving parts, the Power-Pipe® is a maintenance-free system for which RenewABILITY Energy Inc. offers a 10 year warranty.

Power-Pipe Selection

Important note:

The existing drainpipe and the Power-Pipe must have the same nominal diameter. Typical residential drainpipes are either 2 or 3 inch in diameter. The Power-Pipe is currently available in diameters of 2, 3, 4 and 6 inch.

It is critical to accurately measure the available vertical length of continuous drainpipe accessible in your home. The Power-Pipe is available in a variety of lengths. The recommended size is your vertical length of continuous drainpipe less 3 inches, rounded down to the closest Power-Pipe model. Also, the Power-Pipe requires a minimum clearance of 3/8 inch between the drainpipe and the wall or other adjacent structures (See Home Retrofit Selection and Installation Guide for detailed information.)

Plumbing Options

The Power-Pipe can be installed in one of three configurations. The first recommended configuration (known as "equal flow" configuration) which provides the maximum energy and cost savings is to plumb the home''s main fresh water line through the Power-Pipe. If you are worried that your cold tap water may be warm when your shower is in use, you can make a separate cold water line (not pre-heated by the Power-Pipe) running to the kitchen sink.

A second option is to plumb cold water through the Power-Pipe to the water heater only. Finally, the third configuration consists in plumbing cold water through the Power-Pipe to the cold side of the shower fixture only. Either of these options (known as "unequal flow" configurations) will reduce your savings by some 25%.

Home Installation Overview

Important notes:

Follow these 9 steps, as specified in the Home Retrofit Selection and Installation Guide:

  1. Measure, cut and remove the vertical section of the existing drain pipe. Be careful to leave sufficient clearance for connections and fittings.
  2. De-burr drainpipe openings.
  3. Prepare the supplied Fernco sleeve coupling and slide it over the bottom section of the drainpipe.
  4. Remove and prepare the supplied ProFlex steel band and slide the large side over the top cut of the drainpipe.
  5. Place the Power-Pipe into position between upper and lower drainpipe sections. Tighten the connection''s top and bottom per detailed instructions in Home Retrofit Selection and Installation Guide.
  6. Connect the incoming cold water to the bottom of the Power-Pipe coil header.
  7. Connect the top Power-Pipe coil header to supply the rest of the house.
  8. Check and tighten all connections.
  9.  Insulate pipes and supply lines as desired to minimize heat loss and to eliminate condensation.