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 - My Ford Golden Jubilee - by Troy Estes. This article is about my '53 Ford Jubilee and a story that starts with taking the tractor to my brother's Starter/Alternator Rebuilding shop for a wiring fix. The generator was shot as well as all the wiring. I dropped off the tractor expecting a transformation from a 6 volt to a 12 volt system utilizing the original generator housing, and a total rewiring of the whole tractor. The front end center pin bushing was worn also so I ask that they replace it if they had time. Well, that’s wha
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