Last updated: May 28, 2026 · Written by CANRO Heating & Cooling, TSBC Class-A licensed since 1999 · Verified against 2026 FortisBC, BC Hydro, and CleanBC rate cards.
Direct Answer
For most Vancouver homes with an aging boiler and separate tank water heater, yes, switching to a combi-boiler is the right move. You consolidate two appliances into one, gain 95% AFUE efficiency, qualify for $1,000-$2,000 FortisBC rebates, and save floor space. Exception: homes with 3+ bathrooms or multi-zone radiant where dedicated boiler + tankless is better.
Signs your old boiler needs replacing
- 12-15+ years old.
- Multiple service calls in last 12 months.
- Visible heat-exchanger corrosion or leaking.
- Pilot or igniter failures recurring.
- Gas bills climbing.
- Tank water heater also approaching end-of-life (8-12 years).
Combi-boiler advantages over old boiler + tank
- One unit instead of two.
- 95% AFUE vs ~78% for old atmospheric boiler.
- Wall-hung saves floor space.
- FortisBC rebate of $1,000-$2,000.
- Eliminates standby loss from old tank.
- Single annual service instead of two.
When to stay with separate boiler + tank
- Very large home (3,500+ sq ft) with high peak demand.
- 3+ bathrooms with simultaneous heavy DHW use.
- Multi-zone radiant with very different heating + DHW patterns.
- Homeowner prioritizes redundancy (one failure does not lose both).
Cost-benefit analysis
Typical Vancouver retrofit:
- New combi-boiler installed: $9,500-$11,500.
- FortisBC rebate: -$1,500.
- Net cost: $8,000-$10,000.
- Annual gas savings vs old: $200-$400.
- Avoids tank replacement at year 10: $2,800-$3,500.
Combi-boiler retrofit typically pays back in 8-12 years on energy alone, plus eliminates the looming tank replacement.
Data sources
Frequently asked questions
Q: Should I replace my old boiler with a combi-boiler?
A: For most Vancouver homes with 1-3 bathrooms, yes. Combi consolidates two appliances, raises efficiency, and qualifies for rebates.
Q: Will it work with my existing radiators?
A: Yes — modern combi-boilers handle radiator, baseboard, and radiant loops. CANRO verifies during free consultation.
Q: What about hot water flow?
A: Combi-boilers deliver 4-6 GPM DHW — enough for 1-2 simultaneous fixtures.
Q: How long does the conversion take?
A: 1-2 days for most Vancouver retrofits. CANRO handles permit, install, commissioning, and rebate paperwork.
About the author
CANRO Heating & Cooling is a Burnaby-based HVAC and gas-fitting company serving Metro Vancouver since 1999. TSBC Class-A gas-fitting licence holder. Red Seal HVAC technicians. WorkSafeBC registered. Factory-trained authorized installer for Mitsubishi (Elite Diamond Dealer), Daikin (Comfort Pro), Navien (NCB Certified), IBC, Viessmann, Triangle Tube, Bosch, Bradford White, Rheem, and 15+ other manufacturers. 4.9★ rating across 85+ verified Google reviews. Office: 1100 Lougheed Hwy area, Burnaby, BC.
CANRO Heating & Cooling — TSBC Class-A gas-fitting licence · Red Seal HVAC certified · WorkSafeBC and liability insured · 4.9★ from 85+ Google reviews · Serving Metro Vancouver since 1999.
Expert insights: combi boilers in Metro Vancouver
Here is how combi boilers work in the context of Metro Vancouver's climate, codes and homes. A combi (combination) boiler provides both space heating AND on-demand domestic hot water from a single wall-hung unit, eliminating the separate hot-water tank. Modern combi units in Metro Vancouver run at 95-98% AFUE with modulating burners.
Metro Vancouver's housing stock ranges from early-1900s character homes with hydronic radiator systems to modern condos with combi boilers — equipment selection and serviceability vary dramatically by housing era. CANRO has worked with combi boiler systems across Metro Vancouver since 1999, including installations and service calls in Westwood Plateau, Maple Ridge, Westwood Plateau and Deep Cove.
Technical considerations for combi boilers in Metro Vancouver
Sizing. Combi sizing balances heating load (Manual J) against DHW peak demand (gallons per minute at design temperature rise). Vancouver's 7-9°C incoming water needs ~32°C rise for typical use — usually requiring 150,000+ BTU input.
Lifespan. A combi boiler typically lasts 12-18 years in Vancouver. The DHW side is the limiting factor — annual descaling and combustion service extends life significantly.
Warning signs. Combi-boiler issues include flow-rate drops (scale build-up in the secondary heat exchanger), domestic-hot-water temperature swings, ignition lockouts, and condensate-trap obstructions.
What CANRO checks during a combi boiler service
- Both heating-side and DHW-side combustion analysis
- DHW heat-exchanger descale inspection
- Flow-sensor test and clean
- Domestic-hot-water temperature stability check
- Recirculation pump operation
- All checks from a standard boiler service
Why Metro Vancouver homeowners choose CANRO for combi boiler work
- Founded 1999 — over 25 years of a combi (combination) boiler installations and service calls in Metro Vancouver
- 4.9-star rating from 85+ verified Google reviews
- Direct workers, no subcontractors — the tech who installs your system is the one who answers when you call back
- Free written estimates on installations; transparent diagnostic fee on repairs (credited toward the repair if you proceed)
- TSBC-licensed gas fitter, Red Seal HVAC, WorkSafeBC and liability insured
- Permits filed and inspected on every gas-appliance install (BC Code-compliant)
- Brand specialist coverage: Viessmann, IBC, Baxi, Laars, Weil-McLain, Navien, Rinnai, Bradford White, Carrier, Lennox, Bryant, Goodman, Mitsubishi, Daikin, Bosch and more
Combi boiler FAQs
Is a combi boiler the right choice for my Vancouver home?
Combi boilers work well for 1-3 bathroom homes where you want to free up the floor space currently taken by a hot-water tank. For 4+ bathroom homes or homes with significant simultaneous DHW demand (multiple showers + dishwasher + laundry), a heating-only boiler plus an indirect tank usually delivers better DHW performance.
What size combi boiler do I need?
Combi sizing balances two loads: heat-loss calculation (Manual J) for space heating, and peak DHW demand (gallons per minute at design temperature rise). Vancouver's 7-9°C incoming water needs ~32°C rise — typical family installs need 150,000-200,000 BTU input.
How does a combi boiler differ from a tankless water heater?
A combi boiler heats BOTH the hydronic heating loop AND domestic hot water; a tankless water heater handles ONLY domestic hot water. Combi units use the same heat exchanger for both via internal valving — efficient and space-saving, but slightly more complex than a dedicated tankless plus separate heating boiler.
What brand combi do you recommend in Metro Vancouver?
Top combi options for Vancouver homes: Navien NCB-H (best turn-down ratio, built-in recirculation option), IBC SL series (BC-engineered, local technical support), Viessmann Vitodens 222-F (premium European engineering), and Baxi Luna Duo-tec (compact wall-hung). All are properly stocked locally for parts.
Will a combi boiler give me the same hot-water flow as a tank?
A properly sized combi delivers continuous DHW that beats any tank for long showers, but peak simultaneous flow may be slightly lower than a tank for very brief peaks (e.g. two showers + dishwasher all starting at once). Modulating combis with high turn-down ratios (1:10 or better) handle this well.
How often does a combi boiler need servicing?
Annual servicing is essential for combi boilers. The DHW side requires descaling in Metro Vancouver's moderately hard water; the heating side needs combustion analysis, expansion tank check, and condensate-trap cleaning. Skipping service significantly shortens lifespan and voids most manufacturer warranties.
Book combi boiler service in Metro Vancouver
To book combi boiler service or get a free written quote for installation, call CANRO at (604) 359-1081 or email info@canroheat.ca. We service all of Metro Vancouver including Westwood Plateau, Maple Ridge, Westwood Plateau and Deep Cove.
This guide was written by the CANRO Heating & Cooling team based on 25+ years of combi boiler installation, repair and annual service work across Metro Vancouver. Last reviewed May 2026.
