26532-14-0914
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PRODUCT SPECIFICATIONS
Water vapor is a by-product of gas combustion. An unvented room
heater produces approximately one 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
VFRL(18,24,30)
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.
VFRL1810
Natural
Millivolt
3.5" W.C.
10.5" W.C.
45.0" W.C.
Propane
10.0" W.C.
13.0" W.C.
11.0" W.C.
VFIL18
Natural
Intermittent Pilot
4.0" W.C.
10.5" W.C.
4.5" W.C.
Propane
10.0" W.C.
13.0" W.C.
11.0" W.C.
VFIL(24,30)
Natural
Intermittent Pilot
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.
Model
BTU/hr.
Maximum Rate
BTU/hr.
Medium Rate
BTU/hr.
Minimum Rate
Air Shutter Open-
ing
VFRL1810N
10,000
N/A
N/A
Closed
VFRL1810P
10,000
N/A
N/A
1/8" Dia. Pin
VF(RL,IL)18N
26,000
N/A
19,000
Closed
VF(RL,IL)18P
26,000
N/A
20,500
5/32"
VF(RL,IL)24N
36,000
N/A
24,000
Closed
VF(RL,IL)24P
36,000
N/A
27,000
1/8"
VF(RL,IL)30N
40,000
N/A
28,000
Closed
VF(RL,IL)30P
40,000
N/A
30,000
1/8"
Note:
Thermostats are for Vent-Free Applications only.
