ThermoDrain TDX 46.23% Efficiency – 3″ Drain Water Heat Recovery, 41.5″ (Crimp PEX)

Next-Generation Drain Water Heat Recovery

The ThermoDrain™ TDX series is the next evolution in Drain Water Heat Recovery (DWHR). Its robust stainless steel construction and refined compact design maintain high thermal efficiency while simplifying installation. As warm wastewater flows down the drain stack it heats the central copper drain tube; incoming cold water captures that heat and preheats the supply feeding your water heater and/or shower — recovering energy that would otherwise be lost down the drain.

Key Features

• 46.23% verified thermal efficiency at 9.5 L/min (2.5 GPM)
• Rough-in installation: ABS solvent-cemented directly into the main 3″ stack — no mechanical couplings
• Unique 360° swivel potable-water connections for effortless alignment in tight spaces
• Factory-installed ¾″ crimp PEX fittings (CSA B137.5 / ASTM F1807)
• Stainless steel 316L body with DWV copper drain tube (ASTM 306)
• No moving parts, zero maintenance, compatible with all water heaters (tank, tankless, hybrid, solar)

Technical Specifications

• Efficiency (CSA B55.1:20 verified, 9.5 L/min): 46.23%
• Drain diameter: 3″ | Nominal length: 41.5″
• Maximum recommended flow rate: 20.0 LPM (5.5 GPM); pressure rating 150 psi (1030 kPa)
• Certifications: CSA B55.1:20, CSA B55.2:20 double-wall protection, NSF/ANSI/CAN 61 and 372
• 5-year warranty

Installation

Installed vertically in the 3″ main drain stack during rough-in and integrated using ABS solvent cement. Preheated water can feed the water heater cold inlet, the shower cold side, or both for the maximum-efficiency new-construction configuration.