Originally Posted by Bbq Bubba
FYI...check with your HD before purchasing a tank, and I wouldn't advise a residential unit, open flame and venting issues.
By all means check with the HD first. I put in a 6 gal electric and it works great but with my sinks the only way it meets spec is at 150F temp setting. If you have propane in your unit getting an RV water heater si the way to go. But remember it vents out the side so it needs to be in a safe place not by the vending window.
And there's a formual for calculating the total volume of your 4 sinks and then determining how much water can be raised 100F within an hour to fill them. It is complicated but if you do your site plan first and give them all the specs of what you want to buy they can suggest smaller sinks or larger heater if needed. Once it's installed it's a lot more to tear out and replace with bigger. And what you think is enough water is not what the HD thinks is enough for washing.