BOOST TICKET MARGINS. 45-MINUTE ROUGH-IN. ZERO CALLBACKS.
ThermoDrain® drain water heat recovery (DWHR) systems are engineered specifically for US jobsite realities, residential rough-ins, and emergency water heater change-outs. For standard 3" residential stacks, the TDX Series glues directly into PVC or ABS DWV stacks with factory direct solvent-weld hubs and factory-installed 3/4" PEX ports—no torch soldering near wood framing. For 4" commercial and multi-family stacks, the TD442 installs using standard shielded mechanical couplings onto PVC, ABS, or cast-iron risers. Add high-margin, profitable hardware to every truck roll with zero electrical connections, zero moving parts, and full CSA B55.1 / CSA B55.2 certified listing compliance.
Monetize Every Water Heater Change-Out & Basement Renovation
+$300 to $600 Margin
Per truck roll / installation
When a customer calls with a failed water heater or complains that their family runs out of hot water after two morning showers, upsizing to a 75-gallon tank often triggers major obstacles: electrical service upgrades (100A to 200A panel changes), larger breakers, or new B-vent/direct-vent drilling. Adding a ThermoDrain solves the capacity issue immediately while putting an extra $300 to $600 in net profit on your invoice:
The 30-Second Customer Script:
"While your plumbing is drained down today, we can cut in a ThermoDrain on your main shower stack. It uses the warm water heading down your drain to preheat incoming winter water from 45°F up to 70°F before it hits the tank. That gives you up to 3x more continuous shower capacity, slashes your water heating bill by 30% to 40%, has zero moving parts, and will outlast your next two water heaters."
Tankless Water Heaters
Preheating cold inlet water cuts the required temperature rise (ΔT) in half, preventing automatic winter flow-rate throttling so multi-head master showers maintain full GPM delivery.
Heat Pump Water Heaters (HPWH)
Cuts instantaneous shower demand by 30% to 50%, keeping the unit running in high-efficiency heat pump mode and preventing 4,500W electric backup resistance elements from engaging.
Standard Gas / Electric Tanks (40/50 Gal)
Supplies preheated cold water directly to both the tank dip tube and the shower cold port, extending hot water draw duration by over 50% without rewiring or upsizing the tank.
Field Documentation
Download Official Job-Site Installation Manuals (PDF)
Job-site printable PDF guides featuring detailed rough-in schematics, clearance specs, and code references:
TDX Series Manual
Residential
Covers 3-inch TDX units with direct solvent-weld PVC/ABS sleeves and factory 3/4" PEX crimp ports.
TDH & Commercial TD Manual
Commercial / Multi-Family
Technical manual for 4-inch vertical risers (TD442/TD460) and horizontal TDH models using No-Hub couplings.
Plumber Model Sizing & Specification Table
Match vertical clearance on the main stack. All models certified to CSA B55.1 (performance) and CSA B55.2 (vented double-wall):
| Model (SKU) | Drain Size × Length | Min. Stack Clearance | Drain Connection | Potable Connection | Tested Efficiency | Head Loss @ 2.5 GPM |
|---|---|---|---|---|---|---|
| TDX3240B | 3.0" × 24.0" (610 mm) | 28.0" (711 mm) | Direct Solvent Weld (PVC/ABS) | 3/4" PEX Crimp (F1807) | 33.59% | 1.3 psi (9.0 kPa) |
| TDX3350 | 3.0" × 35.0" (889 mm) | 39.0" (991 mm) | Direct Solvent Weld (PVC/ABS) | 3/4" PEX Crimp (F1807) | 42.10% | 1.9 psi (13.1 kPa) |
| TDX3615 | 3.0" × 61.5" (1562 mm) | 66.0" (1676 mm) | Direct Solvent Weld (PVC/ABS) | 3/4" PEX Crimp (F1807) | 55.04% | 2.4 psi (16.5 kPa) |
| TD442 | 4.0" × 42.0" (1067 mm) | 46.0" (1168 mm) | Shielded No-Hub Couplings | 3/4" Sweat / NPT | 46.20% | 1.8 psi (12.4 kPa) |
| TD460 | 4.0" × 60.0" (1524 mm) | 64.0" (1625 mm) | Shielded No-Hub Couplings | 3/4" Sweat / NPT | 55.30% | 2.2 psi (15.2 kPa) |
| TD472 | 4.0" × 72.0" (1828 mm) | 76.0" (1930 mm) | Shielded No-Hub Couplings | 3/4" Sweat / NPT | 59.10% | 2.5 psi (17.2 kPa) |
Top Choices Residential Units
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TDX Compact | TDX3240 (33.59% Efficiency)
Regular price $197.33 USDRegular priceUnit price per -
TD Commercial High-Flow | TD442B (46.0% Efficie...
Regular price $746.00 USDRegular priceUnit price $746.00 per item$899.00 USDSale price $746.00 USDSale
