Quantity 10x ($450/unit) ThermoDrain (42.1% efficiency) TDH3335B-DR-PEX *may qualify for free shipping*


Builder pricing for qty 10 TDH3335B-DR-PEX shipping included to most Canadian provinces.

The TDH3335B-DR is the second most widely used unit for residential applications next to the TDH3335B-DR-PEX.

TDH3335B-DR-PEX  Specifications:

  • Comes with factory installed crimp PEX fittings certified to CSA B137.5 and ASTM F1807 (no soldering required)
  • 42.1% Efficiency @ 9.5 L/min (2.5 GPM)
  • 3″ inner drain diameter
  • 33.5″ Length
  • 7.9 kW Heat Recovery
  • 16.3 lbs
  • Equipped with 2 drain couplings
  • Efficiency verified to CSA B55.1
  • Safety certified to CSA B55.2
  • Download TDH specification sheet

Quantity 10x Volume Discount – ThermoDrain TDH3335B-DR-PEX drain water heat recovery with factory installed PEX fittings *may qualify for free shipping*

ThermoDrain is one of the easiest and most affordable ways to achieve energy credits

ThermoDrain TDH3335B-DR-PEX 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 with 2x 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


ThermoDrain drain water heat recovery ThermoDrain


You may also like…