Hydronic heating warms your home by circulating hot water from a boiler through radiators, baseboards, or in-floor tubing. Here's exactly how the system works, room by room.
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Quick answer: A hydronic heating system heats water in a boiler, then circulates that hot water through a closed loop of pipes to radiators, baseboard heaters, in-floor tubing, or an air-handler coil. As the hot water passes through these emitters, it releases heat into each room, then returns to the boiler to be reheated. A pump keeps the water moving and a thermostat controls when the boiler fires.
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Hydronic heating uses water instead of air as the medium that carries heat around your home. A gas or electric boiler heats water to a set temperature, and a circulator pump pushes that hot water through a closed network of copper or PEX piping to heat emitters throughout the house — cast-iron radiators, baseboard convectors, in-floor radiant tubing, or a fan coil that also feeds your ductwork. As water passes through each emitter, it gives up heat to the room, cools slightly, and returns through a separate pipe back to the boiler to be reheated. The water itself is rarely replaced; it just keeps cycling through the same closed loop, which is why an expansion tank is built into the system to absorb the small volume changes as water heats and cools.
Because water carries far more heat per volume than air, hydronic systems can run at lower supply temperatures than forced-air furnaces while still delivering steady, even warmth. Many Metro Vancouver homeowners notice hydronic heat feels less drafty than forced air — there's no blower pushing air around, just gentle radiant or convective warmth from the emitters themselves.
| Component | Role |
|---|---|
| Boiler | Heats the water; gas-fired boilers use a burner and heat exchanger, electric boilers use resistance elements |
| Circulator pump | Moves hot water through the piping loop to emitters and back |
| Heat emitters | Radiators, baseboards, in-floor tubing, or a fan-coil unit that release heat into each room |
| Expansion tank | Absorbs pressure changes as water expands when heated |
| Zone valves or zone pumps | Let different areas of the house be heated independently, on separate thermostats |
| Thermostat(s) | Signal the boiler and zone valves/pumps when heat is needed |
| Pressure-reducing valve and relief valve | Maintain safe system pressure and protect against over-pressurization |
All three are hydronic emitters, but they distribute heat differently. In-floor radiant tubing warms the floor slab or subfloor, which radiates heat upward evenly across the whole room — popular in newer builds and renovated basements in Metro Vancouver because it pairs well with tile and concrete. Cast-iron or panel radiators heat a room through a mix of radiant and convective heat and respond a bit faster than radiant floors. Hydronic baseboards rely mostly on convection, drawing cool air in at the bottom and releasing warm air at the top, and are common in older Vancouver-area townhomes and character homes originally built with hot-water heat.
Many homes also run a hydronic coil inside the furnace or air-handler cabinet, so the boiler heats water that then warms air blown through the existing ductwork — giving you boiler efficiency with the faster response of forced air.
A licensed CANRO technician can diagnose it accurately — same-day response across Metro Vancouver.
📞 (604) 359-1081 Request a free quoteHydronic boilers involve gas piping, venting, and pressurized water systems, so several things are legally and practically off-limits for DIY work in BC. Any gas line connection, burner adjustment, or venting work on a gas-fired boiler must be done by someone holding a valid Technical Safety BC gas licence — this is a legal requirement, not just a recommendation. Re-pressurizing or refilling the system, replacing a failed circulator pump, diagnosing a cracked heat exchanger, balancing multiple heating zones, or servicing a combi-boiler that also supplies domestic hot water all call for a licensed technician's tools and training.
CANRO technicians hold Technical Safety BC gas licence LGA0043870 and boiler licence LBP0046450, with Red Seal certified staff, so this work is handled to code whether it's a routine annual service or a full boiler replacement.
A typical hydronic service visit starts with checking system pressure, inspecting the expansion tank, and testing the pressure-relief valve. The technician will check the boiler's combustion and venting, inspect the heat exchanger for scale or corrosion (relevant in Metro Vancouver's harder-water pockets), test the circulator pump, and bleed air from zones as needed. For an older system, they'll also look at the condition of piping, valves, and any signs of mineral buildup that reduce efficiency over time. If a component needs replacing, or if the boiler itself is reaching the end of its service life, CANRO provides a free written quote before any work begins.
Hydronic boilers typically last 15-25 years with regular maintenance, but frequent repairs, rising gas bills, uneven heat, or a cracked heat exchanger are signs it may be time to consider a new high-efficiency boiler rather than continuing to repair an aging one. In Metro Vancouver, installed high-efficiency boiler replacement typically runs $7,500-$15,000+ depending on sizing, venting requirements, and whether the domestic hot water is combined into the same unit; a new boiler installation in a home without existing hydronic infrastructure runs $6,500-$14,000+. Because every home's piping, venting, and zoning setup is different, the only way to get an accurate number is a free written quote after an in-home assessment.
On the financing side, current programs change from year to year, so it's worth confirming exact figures at quote time — but options worth asking about include the interest-free Canada Greener Homes Loan (up to $40,000), the Oil to Heat Pump Affordability program if applicable, and rebates through CleanBC, BC Hydro, or FortisBC for qualifying high-efficiency equipment.
⚠️ Safety note: If you ever smell gas near your boiler or hydronic piping, do not touch any switches, thermostats, or valves — leave the home immediately, and once safely outside call the FortisBC gas emergency line at 1-800-663-9911. If you notice soot, a persistent burning smell, or suspect carbon monoxide (headache, dizziness, nausea near the mechanical room), leave the house immediately, get to fresh air, and call for emergency help before re-entering. Under BC law, all gas line, burner, and venting work on a hydronic boiler must be performed by a licensed gas fitter — never attempt to adjust gas connections, venting, or burner components yourself.
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📞 (604) 359-1081 Request a free quoteReviewed by the CANRO Heating & Cooling service team — July 02, 2026. CANRO holds Technical Safety BC gas licence LGA0043870 and boiler licence LBP0046450, employs Red Seal certified technicians, and carries WorkSafeBC and liability insurance. 4.9★ from 85+ Google reviews · serving Metro Vancouver since 1999 · (604) 359-1081 · info@canroheat.ca.
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