Specifications
WMN20A, GWN20TA
• Btu (Variable): 10,000/20,000 Btu/Hr
• Type Gas: Natural Only
• Ignition: Piezo
• Pressure Regulator Setting: 3" W.C.
• Inlet Gas Pressure (in. of water): Maximum - 10.5", Minimum - 4"
GWN30TA
• Btu (Variable): 15,000/30,000 Btu/Hr
• Type Gas: Natural Only
• Ignition: Piezo
• Pressure Regulator Setting: 3" W.C.
• Inlet Gas Pressure (in. of water): Maximum - 10.5", Minimum - 4"
WMP20A, GWP20TA
• Btu (Variable): 10,000/20,000 Btu/Hr
• Type Gas: Propane/LP Only
• Ignition: Piezo
• Pressure Regulator Setting: 8" W.C.
• Inlet Gas Pressure (in. of water): Maximum - 14", Minimum - 11"
GWP30TA
• Btu (Variable): 15,000/30,000 Btu/Hr
• Type Gas: Propane/LP Only
• Ignition: Piezo
• Pressure Regulator Setting: 8" W.C.
• Inlet Gas Pressure (in. of water): Maximum - 14", Minimum - 11"
Service Hints
When Gas Pressure Is Too Low
• pilot will not stay lit
• burner will have delayed ignition
• heater will not produce specified heat
• propane/LP gas supply may be low
You may feel your gas pressure is too low. If so, contact your local natural or propane/LP 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 dealers of this product. If they can’t supply original replacement part(s), call DESA Heating Products’ Technical Ser- vice Department at
When calling DESA Heating Products, 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 part to the factory.
Parts Not Under Warranty
Contact authorized dealers of this product. If they can’t supply original replacement part(s), either contact your nearest Parts Central (see page 27) or call DESA Heating Products at 1-
When calling DESA Heating Products, have ready
• model number of your heater
• the replacement part number
Technical Service
You may have further questions about instal- lation, operation or troubleshooting. If so, contact DESA Heating Products’ Technical Service Department at
You can also visit DESAHeating Products’ tech- nical service web site at www.desatech.com.
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 Heat- ing Products.
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