Water Heater Myths & Misinformation Blog #4

Tankless Water Heaters

In this blog series, we will explore some of the common water heater myths and misinformation that customers frequently call to talk about.

Myth #4 – Tankless water heaters provide instant hot water.

Tankless water heaters are frequently advertised as being able to provide instant hot water, and while it is partially true, there is a bit more to this claim that isn’t often advertised.

As we have previously mentioned in this blog, storage hot water tanks provide instant hot water because their function is to store water and keep it heated to a desired temperature so it is constantly ready for use. However, this is inefficient as sitting hot water eventually cools and either your electric water heater elements will turn on to keep the water heated, or your gas water heater’s pilot light will fire up to keep the temperature constant, even if the hot water isn’t going to be used.

With a tankless water heater, the water his heated as it passes through the unit, but it only passes through the unit when you turn on a faucet or use an appliance that requires hot water. Because it takes a short period of time for the water to heat up, there is a small lag to receive hot water to your plumbing fixture (faucet, showerhead, etc.) or appliance.


Hot tankless water heaters work.


But do not fear, this lag can be reduced or eliminated by having a re-circulation pump (a.k.a. hot water circulation pump) installed! (This is what isn’t always mentioned in the ads). This keeps water moving through the unit and allows the tankless unit to provide instant hot water!


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