Product Specifications; Water Vapor: A By-Product Of Unvented Room Heaters - White Mountain Hearth VFDR18LB10N-1 Installation Instructions And Owner's Manual

Model
VFDR(18,24,30)LB
VFDR18LB10
VFDT(18,24,30)LB
VFDM(18,24,30)LB

WATER VAPOR: A BY-PRODUCT OF UNVENTED ROOM HEATERS

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.
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PRODUCT SPECIFICATIONS
Gas Valve Type
Natural
Millivolt
Propane
Natural
Millivolt
Propane
Natural
Thermostat
Propane
Natural
Manual
Propane
Model BTU/hr.
Max. Rate
VFDR18LB10N 10,000
VFDR18LB10P 10,000
VFDR18LBN 28,000
VFDR18LBP 28,000
VFDR24LBN 34,000
VFDR24LBP 34,000
VFDR30LBN 40,000
VFDR30LBP 40,000
VFDT18LBN 28,000
VFDT18LBP 28,000
VFDT24LBN 34,000
VFDT24LBP 34,000
VFDT30LBN 40,000
VFDT30LBP 40,000
VFDM18LBN 28,000
VFDM18LBP 28,000
VFDM24LBN 34,000
VFDM24LBP 34,000
VFDM30LBN 40,000
VFDM30LBP 40,000
Regulator Pressure Gas Inlet Pressure
Setting
3.5" W.C.
10.0" W.C.
3.5" W.C.
10.0" W.C.
6.0" W.C.
10.0" W.C.
6.0" W.C.
10.0" W.C.
BTU/hr.
Med. Rate
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
23,000
25,000
29,000
30,000
32,000
36,000
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).
Gas Inlet Pressure
Max Minimum
10.5" W.C. 4.5" W.C.
13.0" W.C. 11.0" W.C.
10.5" W.C. 5.0" W.C.
13.0" W.C. 11.0" W.C.
10.5" W.C. 7.0" W.C.
13.0" W.C. 11.0" W.C.
10.5" W.C. 7.0" W.C.
13.0" W.C. 11.0" W.C.
BTU/hr.
Min. Rate
N/A
N/A
19,000
22,000
24,000
26,000
27,000
31,000
19,000
22,000
24,000
26,000
27,000
31,000
19,000
22,000
24,000
26,000
27,000
31,000
23099-0-0407