NETZERO ThermoDrain TDH3620B-DR high performance drain water heat recovery unit


The TDH3620B-DR is the most popular unit for those seeking the highest efficiency possible and yet, fit in a common basement space.
NETZERO and PASSIVEHOUSE builders use this unit to achieve the highest heat recovery from waste water possible.

TDH3620B-DR  Specifications:

  • 57.2% Efficiency @ 9.5 L/min (2.5 GPM)
  • 3″ inner drain diameter
  • 62.0″ Length (perfect length for typical basements)
  • 10.7 kW Heat Recovery
  • 32.4 lbs
  • Equipped with 2 drain couplings
  • Male 3/4 copper water connections
  • Efficiency verified to CSA B55.1
  • Safety certified to CSA B55.2
  • Download TDH specification sheet


ThermoDrain TDH3620B-DR (57.2% eff) drain water heat recovery

ThermoDrain is an easy and comfortable way to save money and help the environment.

ThermoDrain TDH3620B-DR Model benefits/ features

  • Enjoy hot showers with peace of mind for the environment and energy costs
  • Feel the heat by triples your tank hot water heater capacity for showering
  • Built with the thickest and purest copper for safety and longevity
  • Safety first with double third party certifications for potable water and efficiency.
  • Enjoy significant flow increase on tankless hot water heaters.
  • Quick payback, great return on investment
  • Compact design/ lightweight
  • Maximum efficiency per inch / cost
  • Easy and fast DIY installation (Select the TDH3620B-DR-PEX for factory installed PEX fittings)
  • Includes easy to install drain fittings
  • 50% efficient units are capable of preheating cold water from 50 F to 75 F @ 2.5 GPM
  • Low pressure drop
  • Fits onto any 3″ drain piping system
  • Fits into any 3/4″ potable water type piping



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