Recovering heat from drain water lowers the cost of heating water by 45%

The proven technology of a drain water heat recovery system uses the residual heat in water in drainpipes to preheat water entering the water heater. It offers a number of benefits: it reduces the amount of energy used for water heating (a household’s second biggest use of energy) by 20% to 45%, it’s simple to install and needs no maintenance, and its service life is 30 to 50 years.

See the breakdown of electricity consumption per use

Typical configuration

Installation

Call in a plumbing contractor.

Procedure

For an optimal installation, include a drain water heat recovery system in original building plans. Install a coiled copper pipe around the drainpipe. Cool water from the mains runs through the coiled pipe and is preheated on its way to the water heater.

Requirements

Compliance with standards CSA B55.1 and B55.2, and heat recovery rate of at least 42%.

Where to buy

Drain water heat recovery systems are offered by plumbing contractors.