Residential use wall mounted water boilers are tankless, and are designed to heat water only when a hot-water faucet is opened. Also called instantaneous water heaters, they are available in electric, gas, and propane-heated units.
Most people think that instantaneous means that, when you turn on the tap, hot water comes out instantly. This is not always the case; the heater does not store hot water, but produces it on demand. If the heater is not close by, you still have to wait for
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