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Installed a mixing valve in a way I can bypass ether the boiler or the electric tank if needed and I adjusted the water temperature last night and it seemed to stay a constant temperature through two showers and late night dish washing, then a shower today. My question is, how long will the will the electric tank maintain the hot temperature when not using hot water? Is there a way to run a gravity loop the will keep the water tank temperature the same as the boiler temperature even when not using hot water for an extended period of time?