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Tankless water heater installation

A tankless unit heats water as you use it, so back-to-back showers stop being a problem. It only works well when it is sized for your home and the house can support it. We check both, then tell you honestly whether it makes sense.

Call (416) 489-0000Request service
City of TorontoLicensed & insuredMetro master plumbing licence15791
1212 The Queensway, Etobicoke

Tankless may suit your home if

  • Hot water runs out during back-to-back showers
  • Your tank is getting old and you want to plan ahead
  • You would like the floor space the tank takes up
  • You plan to stay in the home for a good while
  • You own your tank, or your rental contract lets you change it
Wall-mounted tankless water heater in a basement utility area

Sizing comes down to what runs at once

A tank is sized by how much it stores. A tankless unit is sized by how much hot water it can make at one moment. So the question is what your home runs at the same time: two showers and the dishwasher ask far more of it than one shower.

Winter matters too. The water coming into a Toronto home is much colder in January, so the unit has more work to do. We size for that, not for a mild day. An undersized unit shows up as water going lukewarm when someone opens a second tap.

What may need to change in the house

Swapping a tank for a tankless unit is rarely a straight trade. We look at these before you decide:

  • Venting: tankless units have their own venting needs, and the old vent may not suit.
  • Gas supply: gas units can need more gas than the old tank did, so the existing line has to be checked.
  • Water connections: the hot and cold lines usually need rerouting to the new location.
  • Power: most units need an electrical outlet for their controls.
  • Wall space and access: the unit hangs on a wall and has to be reachable for service.

When a tank is the better choice

Tankless costs more to install than a tank, so it pays off best when you plan to stay. If your home has modest hot water needs, or the venting and supply changes would be large, a new tank water heater may serve you better. We will tell you if that is the case.

If your tank is a rental

Many Toronto homes rent their water heater. The rental company owns it, so read your contract before you plan a change. Ask what ending the rental involves and who removes the old tank.

Looking after a tankless unit

Minerals in the water can build up inside the unit over time, and many units have an inlet filter that needs cleaning. Follow the schedule in the manufacturer's manual. Ask us what your model needs.

Financing through Financeit

Financing is available through Financeit for eligible residential projects. Ask Waterworks about the options for your job. Financing is subject to credit approval. Terms and conditions apply.

This page covers tankless water heater repair and tankless water heater installation.

We serve homes in Etobicoke, Mississauga, North York and nearby Toronto communities.

See the work

Watch Michael on the job

Tankless water heaters in Toronto homes

Questions people ask

Who does the work

Michael from Waterworks in a finished shower

Waterworks is owned and run by Michael Yuffa, Owner and Chief Plumber, who has 46+ years of experience with Toronto homes, longer than most of the city's condos have been standing. About our team

  • Metro master plumbing licence 15791
  • WSIB Ontario workplace safety and insurance
  • Insured by Desjardins Insurance
  • Rated 4.8 from 551 Google reviews and 4.9 from 2,273 HomeStars reviews (October 2026)

Written from Waterworks’ service information and the sources named on this page. Last updated November 3, 2026.

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1212 The Queensway, Etobicoke, ON M8Z 1R8

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