Gas tankless water heaters are one of the top worldwide choices. In the United Kingdom 18 million homes get their heating and hot water from natural gas - given this is a country of only 60 million souls, that is a big number.
Natural gas is, of course, one of the few fuels that the UK produces these days, which probably has something to do with the high number. But however you look at it, natural gas is a sensible and economic fuel that has unrivalled convenience.
The gas propane tankless water heater is a great alternative to natural piped gas, and almost as convenient in its liquid form. Like natural gas, it burns hot, meaning that a good system will have no problems lifting the temperature of mains water the seventy or so degrees Fahrenheit that are needed.
Tankless hot water heaters are money savers when you compare them to the more popular (and more wasteful) electric water tanks. Quite simply this is because they only apply heat to the water as you need to use it. Often tanks are kept piping hot for unused hours. Even with a well insulated tank, this is bound to be a waste of energy, and of money.