* Electrical heating: Using heating pipe, heating fast and environmental. Electric cabinet can be added. But, 220V pressure is not suitable, and need to change the water offenly because the heating pipe will be broken by dirt attached.
* Gas heating: Easy to control, water temperature rising very fast, and no spares. But this type may cost much in gas, normally 20kg gas per hour.
* Steam heating: Using a boiler. Long service life but high cost with boiler. It is a good deal in long term.