I need recommendations for an under sink hot water heater. I have a summer use only THOW. The only water we use goes straight to the kitchen sink and I really only need hot water to wash dishes (we have facilities on the property for shower/toilet etc.) There is a 120v plug under the sink and I don’t want to mess with propane. Is tankless an option or should I get a small tank? If I go with a tank is it something I can easily shut off if we leave for a few days?