In many if not most installations, there is little to no net savings. The tankless cost more to buy, costs more to install, and doesn't use much less energy than a tank heater - unless you hardly ever use hot water or - with one exception.
If you have areas in the house that are distant from your main tank heater - installing tankless units at the points where the water is needed can save some energy.
A well insulated electric tank heater doesn't use much energy to keep itself warm - about 1/2 % to 1% of its heat, per hour. So, a well insulated 40 gallon tank heater wastes about 5 gallons of hot water per day.
Tankless heaters aren't any more efficient at actually heating the water than tank heaters, and sometimes less efficient. The hookup to put a tankless in can be expensive.
For example - Small 4.4 GPM tankless gas with a 70 degree rise - needs 3/4" gas lines. Very small 2.5 GPM tankless electric with a 40 degree rise uses a two 40 amp breakers with a 240 volt circuit.
Keep in mind that standard tankless heaters are rated by "temp rise", not "temp." So, a heater rated 2.5 GPM with a 40 degree rise - can raise the existing water temp by 40 degrees when flowing 2.5 gallons per minute. If you have cold well water - at 45F degrees - that means you're going to get 85F degreee water at the 2.5 GPM flow.
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Today's Featured Article - Trailering Your Tractor - by Curtis Von Fange. One of the fun things of summer and fall are the parades and tractor shows that go on across America. Many owners of tractors travel long distances to attend these shows and they usually take their restored iron along with them. Safe trailering practices and inspections will ensure that the event is a fun one. A good habit to develop when using a trailer is to give that �quick look over� before taking it on a trip. Before hooking up to it check the tongue for proper operation. The latche
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