A couple years ago I put in a master bathroom. I embedded some pex in the mortar bed on the floor for future heat. It is cold here, darn cold and my wife is tired of the cold bathroom floor. The basement is insulated fairly well but until I finish it it is not heated so it is cool. I am tight on cash so when I was offered a 12 gallon electric water heater for nothin I got it. I am thinking about putting it in the basement and connecting it to the PEX loop in the bathroom floor above. After bleeding all the air out of everything would warm water from the tank thermosiphon up to and through the loop in the floor?