Scott Flanders from Egret responds:
Knut, first let me say the Dickinson Antarctic heater makes Egret acceptably livable for us, however it is cool down below. I even thought about adding a second, smaller heater in the forward guest stateroom but for the relatively short time we will be here and the difficulty of flue installation we decided not to. The Antarctic and Newport Dickinson both use the same carburetor so the fuel burn is the same. The Antarctic gives the most BTUs and you will need all of them at times however, we usually set the fuel delivery dial at 1.5-2 vs up to 5.

What would be ideal is to add the hot water loop inside the unit when you order it and plumb a stateroom radiator. This is a difficult installation running the hoses and adding the expansion tank above the unit. Perhaps the tank could be put in the exhaust stack. If you added the hot water loop the Newport would be sufficient.

Egret's flue is EXACTLY where it needs to be. When you remove the overhead ceiling panels you'll see why. (We stole 12V from the fan circuit and ran the wires down the stack exiting near the fuel hose - a 1 1/2 amp fuse protects the little heater fan motor.) Also, I believe it's better to not weaken the arch support of the mast by placing the flue to close to the stack. The trick is to drill UP from the salon to center the 5" (12.5cm) hole required for the flue installation. Also, we started with a 22" length of extra pipe for above the boat deck but in the end removed it with no difference in performance.

The 11 gallon (42ltr) gravity feed tank, 41cm high, 33cm deep, 39cm wide, (with 1cm legs for air circulation) is made from stainless steel. We have a drain at the bottom and take the fuel 2cm above the bottom with a valve at the outlet. The tank is insulated with 6-7mm close cell foam and covered with a sumbrella cover. The type A fuel hose (highest grade) is routed thru the exhaust stack exiting just above the carburetor. In the short run from the stack to the carburetor in we added an in-line fuel filter. This tank arrangement works well needing filling every 4-5 days or so. (the tank fits between the steps to the pilothouse roof and the stack)

Bottom line: The Dickinson package works well. It would be ideal with the hot water loop installed with a small circulation pump to circulate the hot water. The picture shows the heater installation and custom stainless steel tray we had made to capture any spilled fuel. (The heater legs are mounted to studs. There are no tray penetrations) The stainless steel heat guard behind the heater mounted to the exhaust stack isn't necessary if you stand the heater 10cm off the wall. We made our shield with round vent holes on the side and added 1.5cm insulation to the inside of the panel. Also, the rocks placed on top of the heater act as a heat sink and increase the heat.

Good luck and enjoy your N46. Ciao