Drain water heat recovery is currently being used in the following standards.
DRAIN WATER HEAT RECOVERY – LEED
Four different rating systems were assessed for the ThermoDrain product and the following results were found:
LEED® BC+C v4: Specifically within the LEED Homes and Multi-family Low-rise v4 and Mid-rise v4, EcoInnovation’s ThermoDrain product is applicable to the following credits:
- EAp1: Minimum Energy Performance
- EAc1: Annual Energy Use
Other resources for LEED drain water heat recovery
DRAIN WATER HEAT RECOVERY
ENERGY STAR FOR NEW HOMES & ENERGUIDE FOR NEW HOMES
NET ZERO READY HOMES DRAIN WATER HEAT RECOVERY
BUILT GREEN® AND DRAIN WATER HEAT RECOVERY
BUILT GREEN® Drain Water Heat Recovery Checklist
This product earns points by providing this function:1.2.9 Install drain water heat recovery (DWHR) units on the main drain stack to recover heat from shower drain water. DWHR units must be CSA certified to B55.1 and B55.2: 1 point for units less than 42% efficient and 2 points for units greater than, or equal to, 42% efficient that are fully insulated (2 points).
HERS AND RESNET
Residential Energy Service Network and Home Energy Rating System
The ANSI/RESNET/International Code Council Standard 301 incorporates new water heating efficiency calculations, including Drain Water Heat Recovery (DWHR) in calculating a home’s HERS Index Score. RESNET accredited HERS Rating Software programs were to incorporate the new standard in their software tools beginning on January 1, 2016. As a result of inconsistencies in incorporating the new standard, the RESNET Board of Directors moved the date that HERS Raters must use the revised software programs to July 1, 2016.
Despite this delay, HERS Raters can still credit DWHR systems through the Innovative Design Request that RESNET has adopted to calculate energy savings for DWHR systems and provide an appropriate HERS Index score credit where these systems are properly installed in homes.
The RESNET Drain Water Heat Recovery Innovative Design Request will remain in effect until the revised HERS rating software tools go into effect.*
Here is addendum B which covers IDRs
Here is the addendum that incorporates DWHR into the standard
* Source = RESNET
PASSIVE HOUSE DRAIN WATER HEAT RECOVERY
NATIONAL GREEN BUILDING STANDARD (NGBS) – THERMODRAIN
National Green Building Standard: Multi-Family 2012 program, ThermoDrain can contribute to the following credits:
- 703.4.3 Water Heating Design, Equipment and Installation DWHR
In the NGBS Remodeling 2012 program:
- 305.3.5 Energy Efficiency