Tankless water heaters
The tankless hot water heater activates as water demand is initialized, however, hot water output is limited by production capacity. A consideration with a tankless water heater is how many degrees of temperature the water heater can raise the water passing through it. Considering a winter climate where city water during the cold season reaches the home at 55°F, a tankless water heater must be able to heat that water to 120°F (an increase of 65°).
This is true.
What I have seen is you end up here in Calgary with a very low hot water output using a TLess WH. (Calgary water 55.3 f)Forget about having a long hot shower or how about 1 hour later to fill the bathtub. What I have seen is tankless HWheaters run in conjunction with large regular water heaters turned on low. Small 6 gallon water set up for small usage. So cold water runs into a 60 g WH (set to hold water temp at about 80 f) from there it goes to a TLess WH set to bring it up to shower temp; from there it goes to a 6 gal water heater designed to be used for washing hands, face, filling up a sink.
So ie: scenario
You turn on a tap to wash hands water goes from main to 60g WH to TLess WH to 6 g WH and you get immediate hot water.
This is an effective way to get the best usage of a stong need for Hot water and the least amount of water used.
(it takes about 3+ g of water run through a Tless wh before it is hot)
Just my 2 cents worth.
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