Condensing Gas
Boiler.
Installation & Replacement.
High-efficiency condensing gas boilers supplied, installed and commissioned across Langley and the Lower Mainland — combi and heat-only, wall-hung and floor-standing, sized properly, vented properly, and set up so they actually condense.
What customers say
4.9 average customer rating
★★★★★
Excellent work! Highly recommend. Professional and efficient; would use again.
Noelle, ChilliwackFaucet installationAugust 2026
★★★★★
Benneth is very knowledgeable, professional, and reliable. He made a great first impression, and I will be using him again for other jobs. Highly recommend!
Joel M., BurnabyToilet installationJuly 2026
★★★★★
Excellent service from Ben at Seastack Mechanical. Ben demonstrated exceptional professionalism, honesty, and work ethic throughout the entire job. His response time was very quick, and he was a pleasure to work with. Although I had mistakenly omitted some of my requirements in the original work order, Ben did not hesitate to return to my home a second time to ensure everything was completed exactly as I wanted. What impressed me most was that he never asked for any additional payment, even though the extra visit was clearly beyond the original scope of work. His positive attitude, integrity, and commitment to customer satisfaction truly stood out. He made sure every aspect of the job was completed to a high professional standard. I am extremely satisfied with his service and would not hesitate to call him again for any future plumbing needs. Highly recommended!
Stephen, MissionHeating system repair (new gas top connection)May 2026
What “Condensing” Actually Means
An older boiler sends its exhaust straight up the chimney while it is still hot. A condensing boiler puts that exhaust through a second heat exchanger, pulls the heat back out of it, and cools the flue gas until the water vapour in it condenses back to liquid. That recovered heat is the difference between roughly 80% efficiency and 95% or better.
The catch is that it only condenses when the water coming back from your heating system is cool enough — under about 54°C / 130°F. A condensing boiler dropped onto an old high-temperature system, with no outdoor reset and no attention to return temperature, will never reach the efficiency on the box. Getting that right is most of the job.
- ✔️ Sealed combustion, so it draws outside air, not room air
- ✔️ Modulating burner that throttles down instead of cycling on and off
- ✔️ Plastic or stainless venting out a side wall — no chimney needed
- ✔️ Outdoor reset, so water temperature follows the weather
- ✔️ Far smaller, and usually wall-hung
Combi Or Heat-Only?
A combi makes your heating and your hot water in one box and needs no tank. A heat-only or system boiler does heating alone and feeds an indirect tank. Combis suit townhouses, suites and smaller homes; larger homes with two bathrooms running at once are usually better served by a boiler and a tank.
Bigger Is Not Better
An oversized boiler short-cycles, wears out its ignition components and burns more gas, not less. We size from the actual heat loss of your building and the emitters you have, not from whatever was on the wall before.
Rebates
Efficiency rebate programs in BC change from year to year and depend on what you are replacing. We will tell you at quote time which ones your job currently qualifies for, and we will not promise an amount we cannot confirm.
What A Proper Installation Includes
Heat Loss & Sizing
We measure what the building actually needs and what your radiators, baseboards or floor loops can deliver, then size the boiler to that.
Gas & Venting
Gas line capacity checked and upsized where needed, and a vent route planned for the new sidewall intake and exhaust, with correct clearances from windows, doors and property lines.
Permits
Municipal permits pulled before work starts, and the installation left ready for inspection. Gas work is carried out under the BC requirements that apply to it.
Near-Boiler Piping
Primary/secondary piping or a hydraulic separator, correct circulator placement, air and dirt separation, expansion tank, fill and relief — the part that decides whether the boiler lasts.
Condensate & Electrical
A proper condensate drain with a neutraliser where required, so the acidic condensate does not eat your drains, plus dedicated power and controls wiring.
Commissioning
Combustion checked and adjusted with an analyser, outdoor reset curve set, zones balanced, safeties proven, and the system handed over with the settings written down.
Condensing Gas Boilers We Install In The Lower Mainland
IBC
SL Series and SL G3 combi and heat-only, DC Series dual-coil, HC Series high-capacity, V-Series. Made in Burnaby — the local default, with parts and technical support in the same time zone.
Navien
NCB-H and NCB-E condensing combi, NHB heat-only and NFB fire-tube. Common in newer Willoughby and Clayton homes, typically 80–199 MBH.
Rinnai
I-Series condensing boilers and combi units, plus E-Series. Compact wall-hung installs for townhouses and suites.
Viessmann
Vitodens 100-W and 200-W, stainless Inox-Radial heat exchangers and deep modulation — a strong match for radiant floor systems.
Bosch & Buderus
Greenstar combi and heat-only, Buderus GB142 and GB162. Well suited to panel radiator and mixed-emitter systems.
Lochinvar
Knight WHN/WBN, Noble NKB combi, and the Crest line for larger buildings — residential through full commercial plant.
NTI
Trinity Ti, Tx and FTV. Long-standing Canadian line, frequently the like-for-like replacement in homes built in the 2000s.
Triangle Tube
Prestige Solo and Excellence with the stainless tank-in-tank, and the Challenger series — a good answer where hot-water demand is heavy.
Weil-McLain
Evergreen, ECO Tec and Ultra. Usually the upgrade path out of an old Weil-McLain cast iron boiler in the same room.
HTP
UFT fire-tube and Elite Premier, including combi versions with tight turndown for small, well-insulated homes.
Laars & Baxi
Mascot FT combi, NeoTherm for larger loads, and Baxi Luna wall-hung units common in older Vancouver-area installs.
Commercial & High Capacity
Camus, Raypak, Patterson-Kelley and staged multi-boiler banks from roughly 300 MBH up, for strata buildings and commercial mechanical rooms.
We are not tied to one manufacturer. We recommend the boiler that fits your system, your hot water demand and the space you have — and we will say so plainly if the unit you asked about is the wrong one for the job.
Replacing An Old Boiler
Swapping a chimney-vented boiler for a condensing one changes more than the box on the wall. Plan for these, because a quote that leaves them out is not a real quote:
- 🔧 New sidewall venting, and the old chimney abandoned or relined for any appliance left on it
- 🔧 A condensate drain, trap and neutraliser where the drain material needs it
- 🔧 Gas line and meter capacity confirmed for the new load
- 🔧 New near-boiler piping, circulator and expansion tank
- 🔧 System flush, because old debris will foul a new heat exchanger
- 🔧 An indirect tank, if you are moving away from a combi or an old tank
- 🔧 Controls and zoning brought up to the new boiler’s capability
Common Questions
How long does it take?
A straight residential replacement is usually one to two days. Re-piping, venting changes or a new indirect tank can add a day.
How long will it last?
Fifteen to twenty years is realistic for a well-installed, annually serviced condensing boiler. Skipping service is the fastest way to cut that in half.
Can I keep my radiators?
Usually yes. Existing radiators and baseboards often work well, provided the system is set up to run at a lower water temperature.
What about my hot water?
Either a combi, or a separate indirect tank heated by the boiler. We size that around how many fixtures your household actually runs at once.
Get A Condensing Boiler Quote
Send us a photo of your current boiler and its rating plate, or book a site visit. You will get a written quote that lists the equipment, the venting, the piping and the commissioning — not a single number with nothing behind it.
More on systems and repairs: boiler heating systems · mechanical renovations · residential plumbing
