A quick video of our Camplux tankless shower heater. We installed this in about 20 minutes with just basic hand tools.

Part list to convert from a 20lbs tank to a 1lbs bottle
1 Mr Heater1/4" MPT to 1"20 Female
1 1/4" ball valve
1 1/4" x 2" pipe
thread tape
Heat the 20lbs fitting with a propane touch to release the green sealant. After the fitting is removed, use thread tape and assemble all the parts.