There are many options for anyone wanting to take the plunge into the world of tankless gas water heaters. One of the top choices of fuel is gas - this is especially popular in Europe where they have been using tankless systems for much longer than in the US.
In areas where natural gas is available, this can make for an exceptionally good value, convenient and reliable choice - both the water and the fuel are piped to your door and there is no need to store anything.
A gas propane tankless water heater works well as a choice for those who are not served natural gas, since in liquid form it is long lasting and economical. Propane is a particularly common gas for this purpose as it burns hot and can be bought in manageable bottles, or delivered to your door in most areas. In many European countries the man delivering the gas bottles is a familiar local sight.
The great thing about tankless hot water heaters - gas included - is that they turn out to save you money while at the same time being more convenient and easier to use. Since the only water they heat up is that you ask for by opening the faucet, that is the only water you pay to have heated (not a whole tank full). And it is there, hot and ready, every time you wish flip on the faucet.