A tankless water heater has no storage tank: it heats water as it flows through a heat exchanger, so you are not paying to keep a tank of water hot around the clock. Hayes Plumbing sizes, installs, descales and repairs tankless units in Whitby and Brooklin, from Port Whitby and Downtown Whitby to Williamsburg, Taunton North and Downtown Brooklin. Our plumbers come from 448 Ritson Rd. South in Oshawa; most Whitby addresses are 10 to 20 minutes away and Brooklin 20 to 25. If you are pricing tankless water heaters in Whitby, we start by looking at how your household uses hot water and what the installation needs, then put the full price in writing.
Is Tankless a Good Fit for Your Home?
Natural Resources Canada says an ENERGY STAR certified tankless water heater uses 30% less energy, on average, than a storage tank model. Savings depend on the unit and on how your household uses hot water, and the upfront cost is higher, so tankless suits some homes better than others. It is usually worth a closer look when:
- Your household regularly runs out of hot water during back-to-back showers.
- You want the floor space a tank takes up, since a tankless unit mounts on the wall.
- You are finishing a basement or renovating, and the walls are already open for gas and venting work.
- Your current tank is getting old and you would rather plan the change than replace it in a hurry after a leak.
- You already have a tankless unit that has lost output and has never been descaled, in which case service may be all it needs.
How a Tank-to-Tankless Conversion Works
- Sizing. We count the fixtures and appliances that may run at the same time and allow for cold winter water coming into the house, so the unit keeps up on the coldest mornings and not just in summer.
- Gas and venting check. Tankless units often need a larger gas line than the old tank and a dedicated vent of their own. We confirm what your home needs and include it in the written price.
- Installation. The unit, venting, condensate drain and isolation valves go in to code. Isolation valves make every future descaling quicker.
- Hand-over. We start the unit, check the hot water at the taps and show you the valves and the upkeep the unit will need.
Gas Work and Permits in Whitby
A gas-fired tankless unit is a fuel-burning appliance, so Ontario law governs who may install and maintain it. According to the Technical Standards and Safety Authority (TSSA), furnaces and other fuel-fired appliances must be maintained by TSSA-registered contractors, and those contractors must hire TSSA-certified gas technicians. TSSA's online lookup tool lets you confirm a contractor's registration before any gas work is booked.
Permits are a separate question. Whitby's building permit page names plumbing, drains and heating systems as typical permit projects, and a conversion touches the gas piping and venting as well as the water lines. Ask the Town's Building Services Division at building@whitby.ca whether your project needs a permit before the work is scheduled.
Descaling on Whitby Water
Whitby and Brooklin taps are fed by the Region of Durham's Lake Ontario water, and the Region's published hardness for that supply is 125 mg/L as calcium carbonate. When this water is heated inside a tankless unit, minerals settle on the heat exchanger as scale, which slows heating and restricts flow.
For most homes on Durham's municipal water, our tankless maintenance guide recommends a descaling flush once a year, and homes with a water softener can often go a little longer. Natural Resources Canada gives similar advice: have the heater serviced every year or two by a qualified professional. Temperature that wavers mid-shower, longer waits for hot water at the tap and scale-related error codes are signs a flush is overdue.
What a Tankless Conversion Costs
In our hot water tank replacement article, a tankless unit comes to $3,000 to $6,000 installed, against $1,200 to $3,500 for a standard tank. A conversion costs more than swapping one tank for another because of the venting, gas line and condensate work involved. Our 2026 Oshawa plumbing cost guide also lists water heater installation, tank or tankless, at $500 to $1,500 depending on the model and how complex the installation is. Your quote is free, and the full price is confirmed in writing before we start.