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104246
VENT-FREE NATURAL GAS HEATER
®
TECHNICAL
SERVICE
You may have further questions about in-
stallation, operation, or troubleshooting. If
so, contact DESA International’s Technical
Service Department at 1-800-323-5190.
You can also visit DESA International’s
technical service web site at
www.desatech.com.
VN1800ITB VN2550ITB
Btu (Variable) 6,600-18,000 7,000-25,500
Type Gas Natural Only Natural Only
Ignition Piezo Piezo
Pressure Regulator Setting 6" W.C. 6" W.C.
Inlet Gas Pressure (in. of water)
Maximum 10.5" 10.5"
Minimum 7" 7"
Dimensions, Inches (H x W x D)
Heater 23.5 x 18.5 x 8 23.5 x 25.9 x 8
Carton 25.8 x 21.3 x 10.1 25.8 x 28.7 x 10.1
Weight (pounds)
Heater 24 32
Shipping 29 38
SPECIFICATIONS
SERVICE
PUBLICATIONS
You can purchase a service manual from the
address listed on the back page of this
manual. Send a check for $5.00 payable to
DESA International.
SERVICE HINTS
When Gas Pressure Is Too Low
• pilot will not stay lit
• burner(s) will have delayed ignition
• heater will not produce specified heat
When Gas Quality Is Bad
• pilot will not stay lit
• burner(s) will produce flames and soot
• heater will backfire when lit
You may feel your gas pressure is too low or
gas quality is bad. If so, contact your local
natural gas supplier.
REPLACEMENT
PARTS
Note:
Use only original replacement parts.
This will protect your warranty coverage for
parts replaced under warranty.
PARTS UNDER WARRANTY
Contact authorized dealer from whom you
purchased this product. If they are unable to
supply original replacement part(s), call
DESA International’s Technical Service De-
partment at 1-800-323-5190 for information.
When contacting your dealer or DESA In-
ternational, have ready:
• your name
• your address
• model and serial numbers of your heater
• how heater was malfunctioning
• type of gas used (propane/LP or natural gas)
• purchase date
Usually, we will ask you to return the defec-
tive part to the factory.
PARTS NOT UNDER
WARRANTY
Contact authorized dealers of this product.
If they can’t supply original replacement
part(s), call DESA International’s Parts
Department at 1-800-972-7879 for referral
information. When calling DESA Interna-
tional, have ready:
• model number of your heater
• the replacement part number