CODES DU BÂTIMENT THERMODRAIN

Chez EcoInnovation Technologies, nous suivons et respectons les lignes directrices du code du bâtiment établies par chaque province.

Regulatory & Statutory Compliance • National, Provincial & Municipal Standards

Canadian Building & Plumbing Code Compliance Guide.

This statutory compliance brief provides building inspectors, municipal plan examiners, energy advisors (CEEs/CEAs), and mechanical engineers with the legal standards, code clauses, and local bylaws governing ThermoDrain® Drain-Water Heat Recovery (DWHR) installations across Canada.

Verify NRCan Federal Registry Listing Download Certified Spec Sheets → Code Verification Inquiry
CSA B55.1 / B55.2
Efficiency Tested • Vented Double-Wall Certified
OBC 7.4.9.1.(3)
Statutory Exemption for Pipe Upsizing in Ontario
VBBL 2.6.1.12.(2)
Vancouver Service Water Heater Feed Rule
BC Step 3–5 / ZCSC
MEUI Compliance & Peak Electrical Shaving
British Columbia & Municipal Bylaws

City of Vancouver Building By-law (VBBL) & BC Energy Step Code

British Columbia and the City of Vancouver enforce distinct statutory requirements for DWHR that differ from standard model codes:

City of Vancouver By-law Rules

VBBL Book II & Part 10

Under the consolidated Vancouver Building By-law (VBBL Book II - Plumbing Systems and Part 10 Energy Efficiency), two critical rules apply:

  • Article 2.6.1.12.(2) (Plumbing System): "Drain water heat recovery units shall only be used to supply service water heaters." Preheating the cold feed directly to shower mixing valves (equal flow) is prohibited under the Vancouver Plumbing By-law.
  • Sentence 10.2.2.11.(3) (Mandatory Multi-Family DWHR): In Part 10 buildings (excluding 1- and 2-family homes), DWHR is mandatory on the principal shower of each dwelling unit, requiring ≥ 42% steady-state efficiency under CSA B55.1 and CSA B55.2 double-wall construction.
  • VBBL Energy Paths: Under Path 2 (Performance TEDI/MEUI), DWHR reduces domestic water heating electrical loads, keeping projects under the maximum operational GHG cap.

BC Energy & Zero Carbon Step Code

BCBC 9.36.6 / ZCSC

With Step 3 mandatory province-wide, leading BC municipalities (Richmond, City/District of North Vancouver, West Vancouver, Saanich, Kelowna) mandate Step 4 or Step 5 (Net-Zero Ready):

  • MEUI Reduction: Installing a ThermoDrain (TDX3350 or TDX3615) provides an immediate 2.5 to 5.5 kWh/(m²·a) reduction in Mechanical Energy Use Intensity (MEUI).
  • Envelope Trade-off Asset: Adding a DWHR unit avoids costly structural adjustments such as exterior continuous mineral wool (R-12 ci), triple-pane passive house window upgrades, or under-slab XPS foam.
  • Zero Carbon Step Code (ZCSC EL-1 to EL-4): Shaves peak electrical demand during shower rush periods, preventing central or in-suite heat pump water heaters (HPWH) from triggering carbon-intensive electric resistance elements.
Electrification & Winter Hydro Grid Stability: Heat Pump Water Heater (HPWH) Morning Peak Shaving Technical Policy Brief

As provincial building codes accelerate residential fuel-switching toward Heat Pump Water Heaters (HPWHs), Canadian utilities (Hydro-Québec, BC Hydro, Ontario IESO) face extreme winter morning coincident peaks (6:00 AM–8:30 AM). In sub-zero Canadian design conditions, incoming municipal groundwater drops to 4°C–10°C (40°F–50°F). A single 9.5 L/min (2.5 gpm) shower demands over 17 kW of instantaneous thermal power, rapidly exhausting tank capacity and forcing dual 4,500W electric backup resistance elements to engage across thousands of homes simultaneously. Passive DWHR reduces instantaneous shower demand by 30% to 50%, pre-warming incoming water to ~25°C, preserving tank stratification, and preventing costly winter backup element snapback.

Ontario Statutory Exemption OBC Article 7.4.9.1.(3) • Legal Sizing Exemption for DWHR Units

Plumbers Can Legally Upsize a Shower Drain into a Larger DWHR Core (e.g., 2" to 3")

Standard plumbing regulations dictate that no drainage pipe shall be reduced in size in the direction of flow. However, because residential shower fixture drains are 1.5" or 2" while high-efficiency DWHR units feature 3" or 4" cores, the Ontario Building Code incorporates a specific statutory exemption:

Ontario Building Code Article 7.4.9.1. Sentence (3) — "No Reduction in Size" Exemption:

"A sanitary drainage pipe may be connected to a pre-engineered waste water heat recovery system that incorporates piping of a lesser size than required by Sentence (1) provided that it does not convey sewage, (a) from a sanitary unit, or (b) that contains solids."

Statutory Reference: Ontario Regulation 332/12 • 2024 Ontario Building Code Compendium Part 7 (Plumbing).
Meeting OBC SB-12 42% Compliance Installers can transition a dedicated 2" shower drain line into a 3" ThermoDrain TDX3350 (42.10% efficiency) to satisfy SB-12 prescriptive packages, and reduce back to 2" downstream without failing rough-in inspection.
OBC 7.2.4.3.(3) Short-Radius Fitting Exemption The OBC also exempts pre-engineered DWHR systems from standard long-sweep 90° elbow radius rules, permitting factory-engineered compact transitions into basement drops.
Quebec RBQ / CMMTQ Directive

Preheat to Water Heater ONLY (Equal Flow Prohibited)

Under Chapter III (Plumbing) of the Quebec Construction Code and CMMTQ inspection standards, DWHR preheating must route exclusively to the cold water inlet of the water heater. Feeding tempered water into the cold port of a pressure-balanced or thermostatic shower valve compromises anti-scald protection and will fail provincial inspection.

City of Toronto Standard

Toronto Green Standard (TGS Version 4 - Tier 1–3)

TGS sets aggressive caps on Total Energy Use Intensity (TEUI) and Greenhouse Gas Intensity (GHGI) for multi-unit residential buildings (MURBs). ThermoDrain 4-inch cores (TD442, TD460, TD472) on centralized drainage stacks are a primary Domestic Water Heating Energy Conservation Measure (ECM) for Tier 2/3 development charge refund eligibility.

Statutory Harmonization

Cross-Canada Plumbing & Building Code Harmonization Matrix

Summary of code articles, minimum efficiency baselines, and piping rules by jurisdiction:

Jurisdiction Applicable Code / Bylaw Efficiency Baseline Permitted Piping Routing
Ontario (Provincial) OBC Supplementary Standard SB-12 & Article 7.4.9.1.(3) Minimum 42% (CSA B55.1) Preheat to water heater only, or equal flow (where approved locally). Sizing step-up explicitly permitted.
City of Vancouver VBBL Book II (Plumbing 2.6.1.12) & Part 10 (10.2.2.11) ≥ 42% (Mandatory for MURBs) STRICTLY SERVICE WATER HEATER PREHEAT ONLY.
VBBL 2.6.1.12.(2) prohibits direct feed to shower valve.
British Columbia (Province) BCBC 2024 Subsection 9.36.6 (Energy Step Code 3–5) & ZCSC Model specific (MEUI compliance) Preheat to water heater only, or equal flow (dual-feed).
Quebec Code de construction du Québec (RBQ Chapitre III - Plomberie) CSA B55.1 / B55.2 mandatory STRICTLY WATER HEATER PREHEAT ONLY.
CMMTQ enforcement: equal-flow piping prohibited.
City of Toronto Toronto Green Standard (TGS V4) / OBC SB-12 ≥ 42% residential / ≥ 46% MURB Preheat to water heater only, or equal flow.
Alberta & Prairies NBC(AE) Section 9.36 & National Plumbing Code (NPC) Performance trade-off Preheat to water heater only, or equal flow.
Federal (Pan-Canadian) NECB Part 5 & CMHC MLI Select CSA B55.1 / NRCan SPL registered Preheat to central boilers or storage tanks exclusively.

Technical Note: Homes with Septic Systems (OBOA Building Advisory)

In homes constructed with private on-site septic systems, the building drain often exits through the foundation wall 3 to 4 feet above the basement floor. This can restrict vertical clearance beneath first-floor shower traps:

  • Early Plan Coordination: Plan the drain stack layout during initial framing to ensure the DWHR unit is positioned vertically above the building drain invert elevation.
  • Walkout Basements: Walkout lots naturally drop the septic tank elevation, providing full vertical clearance.
  • Compact Core Selection: The 24-inch ThermoDrain TDX3240B requires only 28 inches of vertical stack clearance, making it suitable for tight mechanical rooms or raised septic building drains.
On-Site Field Verification

Plumbing Inspector On-Site Verification Checklist

Field checklist for municipal inspectors conducting rough-in and pre-drywall inspections:

1. Vertical Alignment & Plumb

The heat exchanger must be mounted vertically on the drainage stack. The unit must be within 5 degrees of true vertical to guarantee falling-film annular surface adhesion across the entire copper inner circumference.

2. Stack Drainage Connections

TDX Series: Direct solvent weld connections using standard approved ABS or PVC cement.
TD4 & TDH Series: Connected using heavy-duty, shielded stainless-steel mechanical couplings (e.g., Fernco Proflex). Non-shielded rubber slip-couplings are not permitted.

3. Counterflow Piping Orientation

Cold municipal supply water must enter the bottom port and exit through the top port. This establishes the required counterflow dynamic against downward-flowing greywater.

4. Potable Isolation & Vent Clearance

Inspect the visible vented air gap collar to ensure it has not been caulked, taped, or spray-foamed shut. The atmospheric capillary relief gap (CSA B55.2) must remain open to ambient air.

Energy Advisors & Energy Modeling

HOT2000 & Building Simulation Input Parameters

Energy Advisors (CEEs/CEAs) evaluating homes or buildings for EnerGuide, Novoclimat, Net Zero, or BC Step Code ratings must model the system using the following exact steps:

  1. Navigate to the Domestic Water Heating (DHW) component screen in HOT2000 (v11 or v12).
  2. Enable the Drain-Water Heat Recovery (DWHR) module checkbox.
  3. Select configuration: "Preheating to Water Heater Only" (Mandatory in QC and City of Vancouver; standard in other jurisdictions unless dual-feed is verified on-site).
  4. Select shower drain configuration: Specify the percentage of total home showers that drain through the unit (typically 100% when all upper/main showers route to the 3" core).
  5. Input the certified CSA B55.1 efficiency rating directly from the NRCan Searchable Product List:
    • TDX3240B (24" core): 33.59%
    • TDX3350 (35" core - Meets OBC SB-12 & VBBL 42%): 42.10%
    • TDX3615 (61.5" core - High Performance / Net Zero): 55.04%
    • TD442 (4" × 42" commercial stack): 46.20%
    • TD460 (4" × 60" commercial stack): 55.30%
    • TD472 (4" × 72" commercial stack): 59.10%
*Reference Note: Values entered must match the exact manufacturer name (EcoInnovation Technologies Inc.) and model SKU on the official federal registry to ensure file approval during Quality Assurance audits.