Join Date: Jan 2007
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The exhaust pipe needs a swan net in it to prevent water ingress. Preferably, the heater should have a balanced flue - that is, the intake air to the burner comes through a concentric port with the exhaust, that stops both wind differential pressure effects on the burner and gives some degree of wave entry resistance.
Mine is an old Webasto heater. They are used primarily in trucks for stationary heating the cab, but also turn up as options for Mercedes in cold climates. The hot air circuit is entirely separate from the burner circuit, although they share a common fan motor, so given no leaks between the two there is no CO danger. These heaters are not the same as the infamous drip feed oil heaters sold for the domestic market - they are banned in Europe now, I believe, both because of fire hazard and CO emissions. If I were to buy a new one, I would go for the water heater type, it heats both radiators and the tap water onboard.
There are also convection types, which require a chimney, not for me though.