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Water Heaters · Power VentPower Vent Water Heater Installation
A power vent water heater carries a blower on top that pushes exhaust out through plastic pipe in a sidewall, instead of relying on a chimney to draw it up. It is what goes in when the chimney is no longer safe for a gas tank — most often because the furnace beside it was replaced with a high-efficiency unit that now vents in PVC.
The orphaned water heater is the reason this page exists. In thousands of houses here, the old furnace and the tank shared one masonry or B-vent flue, and each drew on the other's heat to keep the draft going. Replace the furnace with a condensing unit venting out the wall, and the tank is left alone in a flue that is suddenly far too large and too cold for it. The exhaust cools, stalls and spills back into the basement. Rust and white staining around the draft hood is the visible symptom; carbon monoxide is the invisible one. There are two correct fixes — a liner sized properly to the tank, described in our note on chimney liners when replacing a furnace, or a power vent tank that stops using the chimney altogether.
A power vent install needs things an atmospheric tank never did. It needs a 120V receptacle within reach of the unit, because the blower and controls are electric and a tank on an extension cord is not an installation. It needs a sidewall route for two- or three-inch vent pipe within the manufacturer's limits on total length and number of elbows. The termination has to clear windows, doors, the gas meter and the property line, and it has to sit high enough that a drift does not bury it — along the lake in Bronte and up on the Hamilton Mountain, that clearance is not theoretical. And the blower is audible, so in a finished basement we think about which side of the wall the bedroom is on before choosing where the tank goes.
Two housing eras drive most of these calls. The 1970s to 1990s subdivisions through Waterdown, Stoney Creek and the Mountain, where a furnace upgrade years ago left the tank on the chimney and nobody flagged it at the time. And newer builds with no chimney in the design at all, where power vent or direct vent was always the plan and the replacement simply has to match. The comparison in power vent versus direct vent covers which one your basement can take.
It is also a reasonable moment to ask whether a tank is still the right answer. If the household regularly runs out of hot water, a tankless conversion may be the better spend; if you are chasing efficiency and have the headroom and drainage, a heat pump water heater is worth pricing. We will give you all three numbers rather than one. How much it costs to replace a water heater in Ontario has the ranges, and you can book an assessment any time.
You need a power vent — or a liner — when
- The furnace was replaced with a high-efficiency unit and the tank is now alone on the old chimney
- There is rust, flaking or white staining around the draft hood on top of the tank
- A strip of tissue held at the draft hood gets pushed away instead of drawn in while the burner runs
- The basement is finished or the house was built without a chimney at all
- A carbon monoxide alarm has sounded in the basement — get everyone out first, then call from outside
How it works
Before anything is quoted we test the draft on the existing tank, look at the flue the furnace left behind, and price the liner and the power vent side by side so you can choose.
Old tank drained and removed, new one set and levelled, vent run and terminated to clearance, receptacle confirmed, gas piped with a shutoff and drip leg, then filled and purged.
Blower and pressure switch verified, a spillage check at the burner, the temperature set against the building code's 49°C ceiling at a tub or shower, and the gas and water shutoffs pointed out to you before we leave.
Brands: We install Rheem and other major-brand power vent tanks; 40 and 50 gallon units cover most households in this area.
Common questions
What is the difference between power vent and direct vent?
A power vent draws combustion air from the room and uses a fan to push exhaust outdoors through one pipe. A direct vent brings combustion air in from outside through a second pipe, so the burner never uses room air — the better choice in a tight, finished or confined mechanical space.
Do I need an electrician?
You need a grounded receptacle within reach of the unit that is not shared with something that will trip it. Most basements already have one nearby; where they do not, adding it is straightforward and gets priced with the job rather than sprung on install day.
How loud is it?
You will hear the blower for the length of a heating cycle — comparable to a bathroom fan, and noticeable only if the tank sits against a bedroom wall or under a home office. Placement usually solves it.
Is a chimney liner cheaper than switching to power vent?
Sometimes, and it depends on the chimney's condition and height. A liner keeps a simpler, quieter atmospheric tank; a power vent frees you from the chimney permanently. We price both because there is no universal right answer.
What about the expansion tank and the drain?
Municipal supply with a backflow preventer or a pressure-reducing valve makes a closed system, and a closed system needs thermal expansion control — see do I need an expansion tank. Where there is no floor drain nearby, the tank gets a pan and a drain line or a pump.