7.8101.6 Drain Heat Recovery

Topic: 
Water Heating
Subtopic: 
Water Use Reduction
Desired Outcome: 
Reduce hot water use at the primary fixtures through heat recovery from the drain
TitleSpecification(s)Objective(s)
7.8101.6a
Hazardous material removal

Health concerns in the removal and replacement of equipment (e.g., asbestos) will be identified

Upon the discovery of hazardous material, written notification and contact information for regional EPA EPA U.S. Environmental Protection Agency, www.epa.gov asbestos coordinator will be provided to appropriate people (e.g., occupant, building operations staff, property manager)

Property manager will be asked to contract with an EPA EPA U.S. Environmental Protection Agency, www.epa.gov -certified asbestos contractor to conduct abatement before decommissioning and replacement (property manager is responsible for abatement or remediation)

Remediate health hazards using EPA EPA U.S. Environmental Protection Agency, www.epa.gov -certified contractors

7.8101.6b
Location

Drain heat recovery will be installed where:

  • Cold water draw is concurrent with a warm drain
  • Vertical drop of drain is sufficient to allow installation of the recovery device

Identify locations that allow for cost-effective heat recovery

7.8101.6c
Installation

Drain heat recovery device will be installed in accordance with manufacturer specifications (e.g., cold water counter flow)

Maximize effectiveness of heat exchange

7.8101.6d
Cold/tempered water supply

The tempered water line (post-drain heat recovery device) will be plumbed:

  • As close to the primary fixture as possible (e.g., showerhead)
  • To fixtures that will have water use concurrent with drain heat recovery (e.g., shower that is supplying the drain water)

Minimize heat loss from tempered water

7.8101.6e
Commissioning

Drain heat recovery device will be checked for leaks

Cold water line above drain heat recovery device will be checked for warmth

Ensure system operates as designed