Aryall, faced with the same problem on my 445. The access hatch over the heater is not large enough. The one behind the settee back is blocked by a the fridge and freezer compressors. The compressors were obviously installed after the water heater. It has been repeatedly recommended that I don’t want to touch the compressors. This means boat surgery. If you cut an opening to remove the old water heater, how did you do it?
Thanks, Steve