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Old 01-11-2011
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Actually its quite common practise to see yachts in the uk fitted with balanced flue instant hot water heaters-for those with a scooped stern with bathing platform outlet is often here.
A balaned flue is where air is taken in through an outer jacket surrounding the inner flue pipe and combustion takes place in a combustion chamber completely sealed from interior of boat.
On caravans and RVs its easier .You can also get ones that take air from inside and flue vent overboard but are problematic /illegal on new builds.
When my boat was built 30 years ago it had one of those instant gas gesers which vented into the cabin-totally no go these days.
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