ThermoDrain

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.

 

Direct energy savings

Commercial and institutional buildings are generally characterized by frequent and high volume usage of hot water that is literally poured down the drain. The ThermoDrain is designed to recover this wasted energy and transfer it directly back into your potable water heating system thereby significantly reducing the costs associated with hot water heating. 

Our dual wall construction heat exchanger is code approved for use with potable water.

WHR technology such as the ThermoDrain, reduces energy consumption

WHR technology such as the ThermoDrain, reduces energy consumption


Your Project Savings Potential 

We will calculate the savings potential of using ThermoDrain in your project. Simply fill out the PDF questionnaire or the online form below regarding your application.

PDF - Commercial profile questionnaire

CLICK HERE TO FILL OUT ONLINE FORM


Existing Projects

Dishwasher Savings Scenario

Through the use of ThermoDrain, The end result is a reduction in hot water load vary from 32% to 45%.

Without ThermoDrain; We start with 100 units of gas, 20 units are lost to water heater exhaust, 80 unit are used by the dishwasher

With ThermoDrain™;  Energy required 40 units, 80 units are used by the dishwasher, (30 are supplied by the water heater   and 50 is supplied by the ThermoDrain)
   

Laundry Savings Scenario

High maintenance heat exchangers with filtration systems have been used for heat recovery in laundry systems. The ThermoDrain does not require maintenance and solids can flow freely through the ThermoDrain without the risk of blockage. Savings expected is 35%, ROI is 2-5 years. 


On slab construction

In the case where slab on grade construction or where the drain flow is in the floor, the drain water must be elevated using a pump. Electrical consumption for pumping drain water is 1-2% of the ThermoDrain energy savings. This type of system is difficult but not impossible to retrofit.
 

Sport center ganged showers scenario

A sport center having 16 showers is operating at a combined total of 100 hours of shower time per week.   Low flow shower heads of 1.6 gpm operate at a shower temperature of 39°C (102°F).  The natural gas heater is 78% efficient.  The annual energy that is wasted down the drain is 272 GJ from the showers alone. 

The potential for drain water heat energy recovery is calculated based on preheating the cold water going to the water heater using 4 ThermoDrain units.  At an estimated 0.46$ per m3, the energy cost saving is 1905$/year with a 3.4 year payback.
 

Hotel scenario

A hotel with 80 rooms is occupied at 70%.  The average shower time per room is 20 minutes per day and standard flow shower heads are used at a shower temperature of 39°C (102°F).  The natural gas heater is 78% efficient.  The annual energy that is wasted down the drain is 583 GJ from the showers alone. 

The potential for drain water heat energy recovery is calculated based on preheating the cold water going to the shower using one ThermoDrain unit for two adjacent rooms.  At an estimated 0.46$ per m3, the energy cost saving is 2654$/year with a 6.8 year payback.
 

Affordable housing complex with central heating scenario

A building having 24 housing units has central water heating.  Three drain stacks service two units per floor each.  Given the total shower time for each unit is 30 minutes per day and standard flow shower heads are used at a shower temperature of 39°C (102°F).  The natural gas heater is 78% efficient.  The annual energy that is wasted down the drain is 281 GJ from the showers alone. 

The potential for drain water heat energy recovery is calculated based on preheating the cold water going to the water heater using two ThermoDrain unit per drain stack.  At an estimated 0.46$ per m3, the energy cost saving is 1519$/year with a 3 year payback. 


Technical Specifications


Savings Calculator


Sustainable LEED Building Projects

coInnovation is an active member of the CGBC

The installation of a ThermoDrain is a simple, proven and efficient measure that will contribute in obtaining credits associated with energy efficient LEED projects. Several LEED projects are presently using ThermoDrain technology to reduce the energy required to heat water. 

 

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Increasing system capacity

The recovery of energy from drain water has obvious economical and environmental benefits but other advantages beyond these considerations exist. A building that incorporates ThermoDrain units as part of its hot water heating system will see a decrease in heating power requirements or in the size of the heating apparatus by recovering the energy that would have otherwise been sent down the drain. This is even more advantageous when less efficient hot water heating equipment is in use.


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ThermoDrain, a proven and recognized technology

Many independent organizations have tested and recognized the efficiency of the ThermoDrain technology including National Resources Canada, the Canadian National Research Centre  the Canadian Housing and Mortgage Corporation, Saskatchewan Research Council, Hydro Quebec and the US Department of Energy.

 


Product design and safety

In order to comply with most plumbing codes in the US and Canada, we build our products with certified components. The components used in building the ThermoDrain have the following certifications. Our product is certified to used to preheat or precool potable water.

  • ASTM 306 « Copper Drainage Tube (DWV) »
  • ASTM B-88 « Seamless copper water tube »
  • ANSI / ASME B16.18 ou ANSI / ASME B16.22 Fittings
  • 3rd party certified for performance and safety by Intertek to CSA B55.1 and B55.2 standards

    CSA Certificiation

Self cleaning and maintenance free

The ThermoDrain is made up of 3rd party ASTM certified copper drain tubing and is considered maintenance free thus retaining its efficiency over time. The ThermoDrain drain tube is the same diameter as the standard copper drain tube and will drain in the same manner with no restriction in the drain flow. 


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