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I had National Grid come to give me an estimate, as I am due to replace my water heater. Very expensive (I think around $2-3k) and the guy actually ended up telling me they couldn't install one for me based on the way my house is set up (can remember exactly why). Much more practical for me to just get a standard water heater for less than $1000 installed.
I'm thinking of one as a backup to my indirect tank -- making the direct a pre-heater to the tankless, so that if the water in the indirect tank isn't hot enough or isn't functioning the tankless will boost the water temp to the house. BTW, there is a federal 30% tax credit (up to $1,500) for most tankless heaters.
I'm also thinking of whether I should install a standard gas tank as a backup. Those do not require any electricity. When the power is off during a storm it would be nice to still have hot water. I guess it can be piped to that I have valves that determine where the hot water would come from. Most of the time the tank will be off but the pilot can be lit during an emergency.
This perked my interest because my house has no hot water tank. I never knew there was such a thing. Totally confused me! I can tell you that the oil burner comes on for a very short span when I run hot water. I use very little oil. I have lived in a few houses over my many years and this is the most fuel efficient one ever. Now on the negative side, my son told that it lessens the years the oil burner lasts due to it working more. I have not been here long enough to experince that and I was not the one that installed this system so I don't know those answers. I just know it is is very effecient.
I'm thinking of one as a backup to my indirect tank -- making the direct a pre-heater to the tankless, so that if the water in the indirect tank isn't hot enough or isn't functioning the tankless will boost the water temp to the house. BTW, there is a federal 30% tax credit (up to $1,500) for most tankless heaters.
I'm also thinking of whether I should install a standard gas tank as a backup. Those do not require any electricity. When the power is off during a storm it would be nice to still have hot water. I guess it can be piped to that I have valves that determine where the hot water would come from. Most of the time the tank will be off but the pilot can be lit during an emergency.
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