Got the propane bill today for our hot water. EXPENSIVE $3.83 per gal. So i need a sidearm to install and the he double hockey sticks with propane. Any good advice on where to purchase one? I have seen them on e-bay and such, but figured i check with all of you before the purchase. Planning on hooking up two 80 gal tanks to cover our overusage of hot water. Pros/cons too two tanks? Four showers and at least two loads of laundry/plus the dishwasher per day.