How long should it take for an Attwood 6 gal propane water heater to get up to temp? I have heard people say to turn it on 10 min before you need it but mine takes about half an hour to get hot.
Depends on how cold the water is to start with. Mine can take 10 to 15 minutes in warmer weather and much longer in the colder times. I just kick mine on when I get up in the morning and just before we start getting ready for dinner.