Long story short... I was asked to wire a hot water heater by a woman who is newly separated. Her husband is enjoying hot showers with his new girlfriend while this woman, her three kids, (the youngest is three months) and all of her salon clients are going without hot water. The house has a boiler, radiant heat, and the hot tap comes off of boiler as well. She's short on cash due to present situation. I am doing free labor. I can sweat pipe. I've never worked on a oil furnace system. Supposedly they had problem a year ago. Had an acid flush a year ago and those guys recommended putting in an electric hot water heater. The acid flush never really corrected the problem and now there is no hot water. The husband bought an electric hot water heater dropped it off a couple weeks ago and it is sitting in the box in the basement. There is no secondary hot water exchange tank. I figured I could bypass the mains into the electric hot water heater and create a diverter for the hot to the faucets. House has kitchen faucet, one bathroom faucet, shower and a salon sink faucet. I don't know if there is a recirculating pump. I'll find out when i look at it.