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A tankless (instantaneous, on-demand) gas water heater provides unlimited hot water the very instant we need it.

We install tankless water heaters from Rinnai. This is the most tried-and-true brand. There are 30 million Rinnai water heaters installed. More than any other brand.

When switching to a on demand unit, two things are important - to know how to use tankless water heater and to choose the right size.

We do installation of on-demand (tankless) hot water heaters in Aurora, Burlington, Brampton, GTA, Mississauga, Oakville, Milton, Peel,  Halton, Richmond Hill, Markham, York, Newmarket, Stouffville, Vaughan, Toronto.
Water heater sizing

Cold water temperature in Toronto goes down to 40°F (4°C) at winter time. If we, for example, want to keep hot water temperature at 110°F, we arrive at 70°F water temperature rise in the water heater.

Manufacturer specs may provide water heater capacity at different temperature rise: 45°F, 65°F, 90°F,

Tankless (On-Demand) Hot Water Heater

Tankless (Instantaneous, On-Demand) Gas Hot Water Heaters

etc. You may have to interpolate the data to assess capacity at 70°F temperature rise.

For a ballpark estimate you can use information below:

An energy efficient shower head uses two gallons of water per minute.
Water heater with gas input of 100,000 BTU/h, provides enough hot water for one shower.
If you need to run two showers at the same time, you will need a unit in 180,000 - 200,000 BTU/h range..

Providing tankless water heaters installation service and repair in Toronto, Mississauga, Burlington, Oakville, Milton, Halton, Brampton, Thornhill, Richmond Hill, Markham, King City, Aurora, Newmarket, Stouffville, Peel, York, Vaughan, GTA.
Resources

Cozy World - Toronto Heating Cooling Contractors

Rinnai Hot Water