Tankless water heaters
On-demand units sized for your peak flow, with proper gas and venting.
Water Heaters · Toronto & York Region
Water Heater Installation, Replacement & Repair in Toronto
Tankless and high-efficiency tank water heaters, sized for your household and installed to code — often the same or next day when your old one fails.
- Tankless & tank specialists
- Sized to your household
- Permits and venting done right
- Same or next-day replacement
5.016 Google reviews
Licensed & insured
Water Heater
Water Heater, done properly
No hot water, a leaking tank or a water heater that cannot keep up? We repair what is worth repairing and replace what is not, with clear advice on the right size and type for your home, the venting it needs and the running cost.
We install tank, tankless (on-demand) and combination systems across Toronto, Richmond Hill, Vaughan and Markham, and replace rental units for homeowners who want to own their equipment.
Water Heater services
Tank water heaters
High-efficiency and power-vent tanks installed and replaced.
Water heater repair
Pilot, burner, thermostat, element, valve and leak repairs.
Rental replacement
Replace a rented tank with one you own, with return of the old unit handled.
Combi boilers
Space heating and hot water from one high-efficiency appliance.
Expansion tanks & valves
Thermal expansion tanks, mixing valves and pressure-relief valves.
Descaling & maintenance
Flushing and descaling to protect efficiency and warranty.
Commercial water heating
Larger and multiple-unit systems for restaurants and buildings.
Clear steps, no surprises
- 1
Tell us your household
People, bathrooms and peak hot water use.
- 2
Recommendation
Tank vs tankless, size, venting and running cost explained.
- 3
Written price
All-in price including removal and any permit.
- 4
Install & test
Installed to code, tested and explained before we leave.
What you get when you hire O Plus
Right-sized, not oversold
We size for real use so you do not pay for capacity you never need.
Gas and venting done right
Licensed and certified work, permits when required.
Fast replacements
Common sizes stocked for quick turnaround.
Ownership savings
We help you compare owning against renting a water heater.
Work we are proud of
Pricing
What affects the cost of water heater?
Every building is different, so we price each job after seeing it. These are the factors that move the number — and you will see each one on your written quote.
Get my exact price- 1
Type
Tankless units cost more to install than tanks but last longer and can cut standby losses.
- 2
Venting & gas
Changing vent type or gas line size adds work.
- 3
Size
Larger households need larger or multiple units.
- 4
Permits & disposal
Permits and removal of the old unit are included in our written price.
Homeowners and businesses trust us with their water and heat
Google
They are reliable and did the best job for me.
Google
Steve has completed a few jobs for us. It has always been a pleasure working with him, great workmanship and fair pricing. Thank you Steve!
Google
Very professional, very punctual and fast, one of the best customer service and quality in terms of material and job. Very skilled, I would recommend to anyone who is in need of plumbing!
Google
Great quality of work by Steve and his team. He was professional, efficient and finished the job in a timely manner. I would definitely recommend him. Thanks for the great work.
Google
Would recommend FIRST! I had a faucet that needed repair. I called 3 plumbers and none could figure out how to even get the faucet handles removed. I was referred to OPlus Plumbing and I spoke with David. He was here in no time, immediately figured out what had to be done, had all the necessary tools on hand and…
Google
We were very happy with this company. It was late at night on a holiday and they were at our home within 2 hours notice. They came ready with all the materials and tools to do the repair of our kitchen sink and made the work seem so easy. The plumber was very efficient and very professional. Will use again…
Google
Davood and Fazel did our entire plumbing from underground drain and sewage pump to all 4 bathrooms, kitchen and basement kitchenette. Super professional services and very caring. I would absolutely recommend them for any minor or major plumbing job. They were responsive to us at any stage. Even after they finished their job, other contractors damaged the water pipes and…
Water Heater — frequently asked questions
How much does water heater replacement cost in Toronto?
Most replacements in 2026 cost about $1,500–$4,000 depending on tank or tankless, size and venting. We give an all-in written price.
Is a tankless water heater worth it?
For many households, yes: endless hot water, a longer life and lower standby losses. They cost more up front and need correct gas and venting sizing.
How long does a water heater last?
Tank water heaters usually last about 10–15 years; tankless units often last 20 years with regular descaling.
Can you replace my rental water heater?
Yes. We install a unit you own and help you arrange the return of the rental tank.
Do you repair water heaters too?
Yes — pilot and burner problems, thermostats, elements, valves and leaks.
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