Drain water heat recovery - Récupérateur de la chaleur des eaux de drainage

Drain water heat recovery (DWHR). ThermoDrain is a drain water heat recovery unit that recovers energy from waste water and transfers this energy to potable water before entering a water heater. It is different from other heat exchangers in that it has dual walls vented to the atmosphere so that cross contamination between wastewater and potable water is not possible. The heat transfer occurs only when wastewater is flowing down the drain while there is a demand on the hot water heater. This technology can save the homeowner up to 40% on their water heating bills. It can also triple the capacity of a hot water tank for showering. It is considered a comfortable green technology designed for shower lovers who also want to save energy. ThermoDrain is a superior drain water heat recovery technology that is manufactured in North America and comes with an industry leading 10 year warranty.


The Passive House Resource - PASSIPEDIA and drain water heat recovery

LINK: Experience with drain water heat recovery

Criteria and algorithms for Certified Passive House Components

: Drain water heat recovery V 0.5, 13.10.2014 ju

LINK: Full document in PDF



Note: We do offer the ThermoDrain in metric sizes. 75mm drain diameter x 22mm coil for countries that are currently using metric standard pipe sizes. The drain couplings supplied are also metric compatible.

Special focus on maximising energy efficiency for hot water 

Wagner Solar receives the first-ever certificates for drain water heat recovery Darmstadt. For millions of people, a hot shower in the morning is an essential part of modern life – but it also consumes a lot of energy. In order to contribute to increased efficiency in this area, the Passive House Institute has introduced certification criteria for systems for heat recovery from wastewater. The first certificates to be issued in this context were presented at the International Passive House Conference 2015 in Leipzig. A white paper on the savings potential of drain water heat recovery is available on the online platform PassipediaPress Release