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PRODUCT SPECIFICATIONS
Water vapor is a by-product of gas combustion. An unvented room
heater produces approximately one (1) ounce (30ml) of water for
every 1,000 BTU's (.3KW's) of gas input per hour.
Unvented room heaters must be used as supplemental heat (a
room) rather than a primary heat source (an entire house). In most
supplemental heat applications, the water vapor does not create a
problem. In most applications, the water vapor enhances the low
humidity atmosphere experienced during cold weather.
The following steps will help insure that water vapor does not
become a problem.
1. Be sure the heater is sized properly for the application, including
ample combustion air and circulation air.
2. If high humidity is experienced, a dehumidifier may be used to
help lower the water vapor content of the air.
3. Do not use an unvented room heater as the primary heat source
(an entire house).
WATER VAPOR: A BY-PRODUCT OF UNVENTED ROOM HEATERS
Model Gas Valve Type
Regulator Pressure
Setting
Gas Inlet Pressure
Max
Gas Inlet Pressure
Minimum
VFDR(18,24,30)LB
Natural
Millivolt
3.5" W.C. 10.5" W.C. 4.5" W.C.
Propane 10.0" W.C. 13.0" W.C. 11.0" W.C.
VFDR18LB10
Natural
Millivolt
3.5" W.C. 10.5" W.C. 5.0" W.C.
Propane 10.0" W.C. 13.0" W.C. 11.0" W.C.
VFDT(18,24,30)LB
Natural
Thermostat
6.0" W.C. 10.5" W.C. 7.0" W.C.
Propane 10.0" W.C. 13.0" W.C. 11.0" W.C.
VFDM(18,24,30)LB
Natural
Manual
6.0" W.C. 10.5" W.C. 7.0" W.C.
Propane 10.0" W.C. 13.0" W.C. 11.0" W.C.
Model BTU/hr.
Max. Rate
BTU/hr.
Med. Rate
BTU/hr.
Min. Rate
VFDR18LB10N 10,000 N/A N/A
VFDR18LB10P 10,000 N/A N/A
VFDR18LBN 28,000 N/A 19,000
VFDR18LBP 28,000 N/A 22,000
VFDR24LBN 34,000 N/A 24,000
VFDR24LBP 34,000 N/A 26,000
VFDR30LBN 40,000 N/A 27,000
VFDR30LBP 40,000 N/A 31,000
VFDT18LBN 28,000 N/A 19,000
VFDT18LBP 28,000 N/A 22,000
VFDT24LBN 34,000 N/A 24,000
VFDT24LBP 34,000 N/A 26,000
VFDT30LBN 40,000 N/A 27,000
VFDT30LBP 40,000 N/A 31,000
VFDM18LBN 28,000 23,000 19,000
VFDM18LBP 28,000 25,000 22,000
VFDM24LBN 34,000 29,000 24,000
VFDM24LBP 34,000 30,000 26,000
VFDM30LBN 40,000 32,000 27,000
VFDM30LBP 40,000 36,000 31,000