so for daily cleanup, I use the hot water from the preheater ( hood). I get 10 gallons there. some times when bottling I will need more that's where the 20 gallon pot comes in. I came across a gas water heater off a job. it is a house unit and bought an all-in-one pump/pressure tank just never seem to need all that. in all had 200 dollars into it. on-demand is nice , but expensive. just my two cents