Happy Thanksgiving to all. I will be purchasingDickinson P12000 heater and installing it in Beneteau 40. Questions: 1. Propane tank - do I purchase a tank, have it filled and install on boat.....or..... use returnable tanks and exchange for full one? Which is more cost effective? 2. Pressure regulator - The Dickinson is a low pressure appliance - pressure regulator at Defender costs over $200......any suggestions?