When it comes to gas hot water heaters tankless models have some really attractive advantages of either gas powered or electrically powered tanks.
The first, and perhaps most obvious, tankless gas water heater advantage is size. These things are much smaller than an equivalent tank. This frees up plenty of space in the home.
On demand water heaters that run on gas are also longer lasting than their tank counterparts. Of course they cost more to buy, but many have expected lives that are twice that of a tank.
Gas tankless hot water heaters also offer very good value for money. This is for two reasons. The first is simply that gas - natural or propane - is good value for heating purposes. The second is the simple fact that on demand units only heat up the water that is needed, whereas tanks need to keep the watertank up to heat all the time.
When it comes time to compare tankless water heaters, gas is one of the best choices. It is the top on demand choice in the world thanks to the speed at which it heats and the large capacities that the larger models can handle. If you are looking for a whole house instant hot water solution, gas is probably your first choice.