Figure 4: Cabin heater double pipe intake / exhaust.


INTAKE/EXHAUST for Room Sealed Combustion System Using LPG for heating creates CGMW25bw 7/24/07 4:19 PM Page 1


condensation as well as CO2 and/or CO, both of which are potentially harmful. Open flames also consume oxygen. The best situation is to contain the flame in such a way that the O2 is drawn in from the outside and the exhaust exits to the outside as well. This is often done by a double pipe


Figure 5: Deck Fitting for Double pipe intake / exhaust.


CAPE GEORGE MARINE WORKS, INC. INTAKE EXHAUST DECK


condensation. This means that an open flame in a boat, when using LPG for heating, creates condensation as well as CO2 and/or CO, both of which are potentially harmful. Open flames also consume oxygen. The best situation is to contain the flame in such a way that the O2 is drawn in from the outside and the exhaust exits to the outside as well. This is called a “Room sealed combustion system” (RSCS) by ABYC (American Boat and Yacht Council). This is often done by a double pipe (Figures 3 & 4). If the heater does not have a RSCS, it must have a carbon monoxide detection system (CMDS), ABYC. All this is a reason not to use a cooking stove as a cabin heater. You can find both fireplaces and forced air units that incorporate either a RSCS or a CMDS. However, the CMDS does not solve the condensation problem and it requires a warning plaque about ventilation as per ABYC. Another element to consider is the BTU rating of the stove which translates into how much heat you will get. For instance, Dickenson Marine says a 20-pound tank will provide 100 hours of cabin heat on high for a 30-32 foot boat.


Cape George 38


Now also building the Lyle Hess


designed 28' Bristol Channel and 22' Falmouth Cutters


31' 34' 36' 38' 40.5' 45'


1924 Cape George Rd. Port Townsend, WA 98368 360.385.3412 www.capegeorgecutters.com


48° NORTH, JUNE 2011 PAGE 38


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