We Install Tankless Every Day — Here's What It Actually Costs in Ontario

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 Prices in Ontario — 2026

Standard Series (Navien S2 / Rinnai RX)

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

Premium Series (Navien A2 / Rinnai RXP / Kepler)

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	$3,333
Rinnai RXP199iN	3-4 baths	$59.99/mo	$3,888
Kepler 199	3-4 baths	$43.99/mo	$3,333

What Affects the Final Cost?

• Model and BTU output — larger homes with more bathrooms need higher-output units
• Venting requirements — most tankless units need new PVC venting which is included in our price
• Gas line sizing — tankless heaters draw more gas than tank units. If your gas line needs upgrading, this adds cost
• Standard vs Premium series — Premium adds recirculation for instant hot water at every tap

Standard vs Premium — What's the Difference?

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.

Is Tankless Worth It in Ontario?

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.

How Long Does Tankless Installation Take?

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.

We Serve All of Ontario

GT Home Services provides tankless water heater installation across Ontario including: