Tankless water heater installation in Toronto is something we do every week, and the question we get first is always the same: what does it cost? So here it is up front. A Navien or Rinnai tankless unit, installed by Epsilon Mechanical, runs $2,800 to $3,800. That covers the unit, the install, removal of your old tank and the gas work, done by a G2-licensed technician from a TSSA-registered contractor. No surprise line items.
Where you land in that range depends on two things: the size of the unit, and what we're taking out to put it in.
What moves the price
Unit size. The two sizes we install most are the 150 series and the 210 series, in both Navien and Rinnai. The 150 suits a smaller home with one or two bathrooms. The 210 is for larger households where two showers and a dishwasher might all be running at once. The bigger unit costs more.
What you're replacing. This is the part most price lists skip.
- A standard mid-efficiency (natural draft) tank. This is the most work, so it sits at the top of the range. A tankless unit vents through two PVC pipes to the outside, one for exhaust and one for intake, so we drill two holes through the wall and run both. The water lines also move: a tank takes its water in at the top, but a tankless hangs on the wall and connects at the bottom, so the piping gets rerouted. The gas line usually changes too. And a natural draft tank doesn't need power, so there's often no outlet nearby; we have to find one or have a receptacle moved.
- A power-vent tank. A bit cheaper. You already have one PVC pipe to the outside for exhaust, so we add the intake and reuse what's there. A power-vent tank needs power, so the plug is often within reach. The gas and water lines still get rerouted to the new wall-mounted unit.
- An existing tankless unit (a "re and re"). The simplest job and the bottom of the range. The venting, gas, water and power are already where a wall-mounted unit needs them, so it's mostly a swap.
Tell us which of the three you have and we can usually give you a firm number over the phone. If you're not sure, send a photo of the tank and the pipes coming off the top.
What's included
- The tankless unit itself, Navien or Rinnai, sized to your household
- Removal and disposal of your old tank
- New venting and the condensate drain the unit needs
- Gas line check and connection by a G2-licensed technician
- Isolation valves, so the yearly flush takes minutes instead of an hour
- A walkthrough of the unit and its controls before we leave
Navien or Rinnai?
We install both, and we're not going to push one over the other. They're priced about the same, they're both well supported in the GTA, and they both last. What makes the difference is the sizing and the install. A perfectly good unit that's too small for the house will leave you with lukewarm water in February, and no brand name fixes that.
If you have a preference, we'll install it. If you don't, we'll recommend based on your venting, your gas supply and how many people are using hot water.
Sizing for Toronto winters
A tankless unit heats water as it passes through, so its output depends on how much it has to raise the temperature. Toronto's incoming water is cold in winter, and that drop in supply temperature means a unit delivers fewer litres per minute in January than it does in July. We size for the cold months, not the brochure number. That's why we ask how many bathrooms you have and whether anyone runs two showers at once before we quote.
Not sure tankless is right for you?
It isn't for everyone. If you need hot water back today and the budget is tight, a standard tank is still a sensible choice, and we install those too. A natural draft tank runs $1,600 to $2,200 installed, and a power-vent tank $2,600 to $3,400. Put that next to $2,800 to $3,800 for tankless and the gap is smaller than most people expect, especially once you're already paying for a power-vent tank.
Tankless makes the most sense when you're replacing a tank anyway, you plan to stay in the house for a while, and you'd rather pay more once than replace a tank twice. We laid out the full comparison, including running costs and lifespan, in our tankless cost guide for Toronto homeowners.
Keeping it running
The one piece of maintenance a tankless unit needs is an annual flush to clear scale, and Toronto's water is hard enough that skipping it will shorten the unit's life. Because we put isolation valves on every install, the flush is a quick service call. We can do it, or we'll show you how.
Where we install
We cover Toronto and the GTA, including Scarborough, North York, Etobicoke, East York, Markham, Vaughan, Richmond Hill and Mississauga. If you're on the edge of that, call and ask.
Tankless water heater questions we get in Toronto
How much does a tankless water heater cost installed in Toronto?
We install Navien and Rinnai tankless water heaters for $2,800 to $3,800 in Toronto and the GTA. The price depends on the unit size (a 150 series versus a 210 series) and on what you're replacing: a standard mid-efficiency tank, a power-vent tank, or an existing tankless unit (a re and re).
Navien or Rinnai: which tankless water heater is better?
Both are reliable, both are priced about the same, and we install both. Sizing the unit correctly for your household matters more than the badge on the front. We'll recommend the one that fits your home, your venting and your gas supply.
Do I need a bigger gas line for a tankless water heater?
Sometimes. A tankless unit draws more gas while it runs than a tank does, so the existing line and meter need to be checked. We confirm this before quoting, so the price you get is the price you pay.
Can I replace a rental hot water tank with a tankless unit?
Yes. Many Toronto homes have a rented tank. You end the rental with the rental company, which usually means a buyout or a return, and we install the tankless unit you own outright. Ask us and we'll walk you through the steps.
What size tankless water heater do I need?
It comes down to how many fixtures you run at the same time and how cold the incoming water is. Toronto's winter water is cold, which reduces how much hot water a unit can deliver per minute. A smaller home with one or two bathrooms is often fine on a 150 series; larger households usually need a 210 series.
How long does a tankless water heater last?
With an annual flush, a tankless unit regularly lasts 20 years or more, roughly twice the life of a standard tank. We install isolation valves on every unit so that yearly service is quick.
Ready for a number? Call (647) 269-9704 or send us a message with a photo of your current tank, and we'll tell you where you land in the range.