Tankless Water Heaters in Oshawa and Durham Region
Endless hot water and lower energy use, when the unit is sized, vented and maintained properly. We install and service tankless water heaters across Durham Region.
A tankless water heater heats water on demand as it passes through a heat exchanger, so there is no storage tank and no standby heat loss. Sized correctly it delivers hot water for as long as gas and water are flowing. Hayes Plumbing sizes, installs and descales tankless units for homes across Oshawa and Durham Region, including the gas line, venting and condensate work that a conversion from a tank usually requires.
What this service includes
Tankless water heater sizing and installation
Tank-to-tankless conversions
Gas line upsizing and dedicated venting
Condensate drains and isolation valves
Annual descaling and service
Repair of existing tankless units
“We had a leak in our basement due to an old water tank. Hayes plumbing had a new tank installed perfectly within 6 hours of my orinal call. Their guys were professional, friendly and worked after hours to get us up and running. I would definitely recommend this company to anyone.”
Licensed plumbers, WSIB certified, BBB accredited and members of the Greater Oshawa Chamber of Commerce.
Written pricing
Free in-home estimates and the price in writing before any work starts.
Local since 1961
Founded in Oshawa by Brian Hayes in 1961, with seven fully stocked service vehicles across Durham Region.
24/7 live operator
A real person answers emergency calls around the clock and dispatches from Oshawa.
How much does a tankless water heater cost in Ontario?
Our hot water tank replacement guide places a tankless unit at $3,000 to $6,000 installed, compared with $1,200 to $3,500 for a standard tank. Tankless conversions cost more than a like-for-like tank swap because of venting, gas line and condensate work. Our 2026 cost guide lists water heater installation at $500 to $1,500, tank or tankless, depending on the model and installation complexity. We confirm the full price in writing before we start.
Common questions about tankless water heaters in Oshawa and Durham Region.
In Oshawa and Durham Region we publish a range of $3,000 to $6,000 installed, depending on the unit, gas line and venting work required.
Usually. Natural Resources Canada says an ENERGY STAR certified tankless water heater uses 30 percent less energy, on average, than a storage tank type. The saving depends on your household: if several showers often run at once, a single unit may not keep up, so we size it to your peak use.
By the number of fixtures that run at the same time and how much the incoming water must be heated in winter. We size it during the estimate.
Annual descaling, which is quick when isolation valves are installed. Hard water makes this essential in Durham Region.
Compare installed cost, lifespan, efficiency and hot water capacity for tank and tankless water heaters, with the 2026 price ranges Hayes Plumbing publishes for Oshawa.
