27440-1-0510
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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)LBW
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.
VFDR18LBW10
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)LBW
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)LBW
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
VFDR18LBW10N
10,000
N/A
N/A
VFDR18LBW10P
10,000
N/A
N/A
VFDR18LBWN
28,000
N/A
19,000
VFDR18LBWP
28,000
N/A
22,000
VFDR24LBWN
34,000
N/A
24,000
VFDR24LBWP
34,000
N/A
26,000
VFDR30LBWN
40,000
N/A
27,000
VFDR30LBWP
40,000
N/A
31,000
VFDT18LBWN
28,000
N/A
19,000
VFDT18LBWP
28,000
N/A
22,000
VFDT24LBWN
34,000
N/A
24,000
VFDT24LBWP
34,000
N/A
26,000
VFDT30LBWN
40,000
N/A
27,000
VFDT30LBWP
40,000
N/A
31,000
VFDM18LBWN
28,000
23,000
19,000
VFDM18LBWP
28,000
25,000
22,000
VFDM24LBWN
34,000
29,000
24,000
VFDM24LBWP
34,000
30,000
26,000
VFDM30LBWN
40,000
32,000
27,000
VFDM30LBWP
40,000
36,000
31,000
Note:
Thermostats are for Vent-Free Applications only.
