Switching to a tankless water heater is one of the most popular upgrades Ontario homeowners are making in 2026. Endless hot water, lower energy bills, and a compact wall-mounted design are hard to argue with. But how much does it actually cost?
This guide breaks down every cost factor so you can make an informed decision.
Tankless water heater installation in Ontario costs $3,111 to $4,222 fully installed depending on the model. Rental plans start at $37.99/month with zero upfront cost and 12-year full coverage.
| Model | Bathrooms | Monthly Rental | Purchase Installed |
|---|---|---|---|
| Navien NPE-180S2 | 2-3 baths | $37.99/mo* | $3,111* |
| Navien NPE-210S2 | 3-4 baths | $40.99/mo* | $3,333* |
| Navien NPE-240S2 | 4-5 baths | $43.99/mo* | $3,555* |
| Rinnai RX160iN | 2-3 baths | $43.99/mo* | $3,111* |
| Rinnai RX199iN | 3-4 baths | $49.99/mo* | $3,333* |
*Includes standard installation only. Any extra work your home needs is quoted before we start.
| Model | Bathrooms | Monthly Rental | Purchase Installed |
|---|---|---|---|
| Navien NPE-180A2 | 2-3 baths | $42.49/mo* | $3,333* |
| Navien NPE-210A2 | 3-4 baths | $45.49/mo* | $3,555* |
| Navien NPE-240A2 | 4-5 baths | $49.99/mo* | $3,888* |
| Rinnai RXP160iN | 2-3 baths | $45.49/mo* | $3,666* |
| Rinnai RXP199iN | 3-4 baths | $59.99/mo* | $4,222* |
| Kepler 199 | 3-4 baths | $43.99/mo* | $3,333* |
*Includes standard installation only. Any extra work your home needs is quoted before we start.
Standard (S2/RX) — delivers endless hot water on demand. When you open a tap, the unit fires up and heats water as it flows through. There can be a brief wait for hot water to reach distant taps.
Premium (A2/RXP) — adds a recirculation pump that keeps a small amount of hot water continuously moving through the pipes. Hot water arrives at every tap almost instantly. Better for larger homes with multiple bathrooms far from the unit.
For most Ontario families with 3+ people, yes. Tankless units are up to 40% more efficient than tank water heaters because they only heat water when you need it. Over 10 years, the energy savings typically offset the higher upfront cost.
Most tankless installations are completed in 3-5 hours in a single visit. This includes removal of the old unit, installation of the new tankless system, new venting, gas line connection, and a full test before we leave.
GT Home Services provides tankless water heater installation across Ontario including:
TSSA registered · Same-day installation · $0 upfront on rental · 4.8★ 140+ Google reviews
Call (647) 677-0037