TDX NetZero Ultra | TDX3720 57.20% Efficiency The Ultimate Performer — Maximum Energy Savings and Unrivaled Capacity

The TDX NetZero Ultra (TDX3720) is our flagship, maximum-efficiency residential drain water heat recovery unit featuring integrated PEX connections. Measuring an extended 72 inches long, this heavy-duty powerhouse is explicitly engineered for high-end projects where capturing the absolute maximum amount of thermal energy is the primary objective. It is the premier specification choice for custom architects, mechanical engineering firms, and elite sustainability consultants across North America.

By capturing falling-film thermal energy from greywater to pre-heat incoming cold water, the TDX NetZero Ultra delivers unmatched performance credits in deep energy modeling frameworks. Operating entirely passively, it features zero moving parts, zero electrical requirements, and zero ongoing maintenance.

Intertek Verified Performance Data

• 9.5 LPM / 2.5 GPM Flow Rate: 57.20% Efficiency (10.70 kW / 36,500 BTU/h)

• 7.0 LPM / 1.85 GPM Flow Rate: 62.40% Efficiency (8.23 kW / 28,082 BTU/h)

• 5.5 LPM / 1.45 GPM Flow Rate: 65.10% Efficiency (6.86 kW / 23,407 BTU/h)

Key Technical Advantages

• Direct-Glue ABS Connection: Built with integrated ABS connection hubs, allowing installers to solvent-weld (glue) the unit directly into standard ABS drain stacks using standard cement—completely eliminating the need for separate mechanical couplings.

• Maximum Net-Zero Performance Credits: Delivers an industry-leading 57.20% baseline efficiency at standard flow, scaling all the way up to an incredible 65.10% for high-efficiency fixtures. This makes it the highest-yielding PEX-ready mechanical upgrade available to easily clear deep energy targets like BC Step Code Tier 5, Passive House, and high-incentive utility frameworks.

• Self-Scouring Solid Waste Passage: The central core features completely smooth, continuous interior copper walls with zero internal restrictions or baffles. Standard residential solid waste passes through seamlessly with zero clogging risk.

• Factory-Integrated PEX Ports: Features built-in PEX-ready manifold connections, slashing jobsite installation times by eliminating the need for separate copper-to-PEX transition adapters.

• Unmatched Hot Water Multiplier: Reclaims a massive 10.70 kW of raw thermal energy, virtually eliminating hot water depletion during back-to-back showers and providing tankless hot water systems with an exceptional performance boost in freezing winter climates.

• Dual-Wall Safety Integration: Features a fully certified double-wall separation barrier (CSA B55.2) with a vented leak path, ensuring 100% security for the potable water supply.

• Ultra-Low Pressure Drop: The advanced manifold configuration keeps hydraulic resistance minimal, preserving full-volume shower performance even in low-pressure municipal zones.

• Lifetime Material Integrity: Crafted from premium, high-conductivity copper that delivers up to 30 to 50 years of continuous, passive thermal recycling.

Ideal Applications

• Ultra-Luxury and High-Performance Custom Homes: The definitive mechanical selection for premium custom estates, eco-resorts, and off-grid architectural designs seeking maximum efficiency metrics.

• Net-Zero and Passive House Communities: A critical structural component used by forward-thinking energy consultants to drastically offload baseline mechanical water heating workloads at the lowest lifecycle cost.

"When your project demands the absolute maximum thermal recovery and code performance points possible, the TDX NetZero Ultra stands alone. It glues directly into the line, integrates with PEX in seconds, and reclaims nearly two-thirds of all wasted shower energy completely passively."