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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An on-demand water heater heats water only when needed, while a traditional tank water heater stores and heats a large amount of water continuously. On-demand heaters are more energy-efficient and provide unlimited hot water, but they have higher upfront costs. Traditional tank heaters are cheaper upfront but less energy-efficient and can run out of hot water.