No, an expansion tank is not required.
There are two types of tank-less water heaters that run on two different fuels. There is a electric heater, and an oil heater. One gets plugged in the other uses oil
A tankless water heater uses less electricity compared to a traditional water heater because it only heats water when needed, whereas a traditional water heater continuously heats and stores water.
A small tank water heater is more energy-efficient, takes up less space, and heats water quickly compared to a traditional water heater.
The inter atomic force is comparatively less in case of liquid
a direct vent water heater is more fuel efficient (cost's less to operate). aside from that there isn't much difference, aside from not needing a double wall flue through the roof on a standard gas water heater.
Installation instructions come with tankless water heater, but would recommend someone experienced enough to install.
At current gas prices they cost less to use and a gas heater gives you a much greater supply of hot water on demand.
You can save more money when purchasing a reliance water heater ,because it is less cash consuming and useful. Purchasing is cheaper them renting one.
A lot less because the water is flowing if it is exiting and it depends on the water pipe size.
A tankless water heater heats water on demand, while an electric water heater stores and heats water in a tank. Tankless heaters are more energy-efficient and provide unlimited hot water, but may have higher upfront costs. Electric water heaters are cheaper upfront but have limited hot water capacity and may be less energy-efficient.
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When water freezes, its molecules form a crystalline structure that causes them to space out more than in liquid form, leading to expansion. This expansion lowers the density of ice compared to liquid water, which is why ice floats.