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Fan Size Calculator Heater Size Calculator Plastic Size Calculator Surface Area Calculators Not sure what size heater you need for your greenhouse kit? Our Greenhouse heater size calculator does all...
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Greenhouse Buying Guide Greenhouse Supplies Guide Grow Light Guide Greenhouse Foundation Guide Greenhouse Supplies Guide Ventilation / Cooling Ventilation is the single most important requirement...
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We are often asked why we don't sell unvented (often referred to as ventless or vent-free) gas heaters. They are cheap. There is no need to for a vent pipe, They are +99% efficient. They produce...


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Williams DV22 Direct Vent Gas Heaters  williams, direct, vent, gas, heater, furnace, wall, mount, dv, vented, greenhouse, sealed, 2203822, 2203821, 4100115, 4100110
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Price: $1,229.00
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    Sealed Combustion & No Electricity Required!Williams direct vent wall heater draws outside air to the sealed combustion chamber and vents exhaust gases directly outside. This feature is highly recommended if you grow orchids. No electricity required, so heater will continue to operate normally even during an electrical power outage. Great heating option for greenhouses, garages, rooms in homes, and work shops.Williams Direct-Vent heaters are designed for quiet operation. Convenient, Piezo...

    Williams DV30 Direct Vent Gas Heaters williams, direct, vent, gas, heater, furnace, wall, mount, dv, vented, greenhouse, sealed, 3003822, 3003821, 4100125, 4100120
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    Price: $1,297.00
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      Sealed Combustion & No Electricity Required!Williams direct vent wall heater draws outside air to the sealed combustion chamber and vents exhaust gases directly outside. This feature is highly recommended if you grow orchids. No electricity required, so heater will continue to operate normally even during an electrical power outage. Great heating option for greenhouses, garages, rooms in homes, and work shops.Williams Direct-Vent heaters are designed for quiet operation. Convenient, Piezo...

      Williams DV14 Direct Vent Gas Heaters  williams, direct, vent, gas, heater, furnace, wall, mount, dv, vented, greenhouse, sealed, 1403822, 1403821, 4100105, 4100100
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      Price: $897.00
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      Availability: In Stock - Usually ships in 1 to 2 days.

        Sealed Combustion & No Electricity Required!Williams direct vent wall heater draws outside air to the sealed combustion chamber and vents exhaust gases directly outside. This feature is highly recommended if you grow orchids. No electricity required, so heater will continue to operate normally even during an electrical power outage. Great heating option for greenhouses, garages, rooms in homes, and work shops.Williams Direct-Vent heaters are designed for quiet operation. Convenient, Piezo...

        Sterling Gas Heater Flame Sensor sterling, gas, heater, part, flame, sensor, J38R06890-003, tf, xf, gg, sf, rf, btu, beacon, morris
        Price: $55.00
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        Availability: In Stock - Usually ships in 1 to 2 days.
        Item #: 4075360 -

          Sterling part # J38R06890-003. Flame sensor for Sterling & Beacon Morris gas heaters. Used On The Following Model Numbers:TF030, TF045, TF060, TF075, TF090, TF100, TF125, TF150, TF175, TF200, TF250, TF300, TF350, TF400, RF030, RF045, RF060, RF075, RF090, SF030, SF045, SF060, SF075, GG030, GG045, GG060, GG075, GG090, GG105, GG120, SF100, SF125, SF150, SF175, SF200, SF250, SF300, SF350, SF400, TC100, TC125, TC150, TC175, TC200, TC250, TC300, TC350, TC400, SC100, SC125, SC150, SC175, SC200,...

          Sterling GF150 Heater
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          Price: $2019 - $3999
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          Availability: Factory Direct - Currently ships in 8 to 12 weeks.
          Item #: 40718 -

            The Sterling Shield GF series gas unit heaters are our most durable commercial heaters. Stainless steel construction on the outside and inside combined with a heavy-duty tubular heat exchanger provides maximum protection against moisture and rust making them a great option for greenhouses, processing plants, agricultural buildings, and any other area where moisture is a problem. Sterling GF heaters feature: tubular heat exchanger, power exhaust system, electronic ignition, advanced diagnostic...

            Sterling GG75 Gas Heater sterling, gg, gg75, gas, heater, free, shipping, deal, sale, furnace, garage, greenhouse, shop, propane, GG075A1NSA11, GG075A1PSA11, GG075A2NSA11, GG075A2PSA11, GG075A1NSB11, GG075A1PSB11, GG075A2NSB11, GG075A2PSB11
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            Retail: $990.00
            Price: $939.00
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              Sterling GG gas heaters are an excellent option for heating garages, greenhouses, sheds, etc. Each Sterling GG heater includes: tubular heat exchanger, electronic ignition, power exhaust system, advanced diagnostic system for dependable worry-free operation, lots of safety features, high power fan to provide even heat distribution, rust-resistant aluminized steel exchanger, and a baked-on enamel finish made to protect them from harsh environments. Designed for propane or natural gas. Some...

              Sterling GG90 Gas Heater sterling, mestek, gg, gg90, heater, gas, unit, sale, furnace, beacon, morris, dayton, greenhouse, garage, forced, air, fired,ceiling, mounted, GG090A1NSA11, GG090A1PSA11, GG090A2NSA11, GG090A2PSA11, GG090A1NSB11, GG090A1PSB11, GG090A2NSB11, GG090A2PSB11
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              Price: $1,065.00
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              Availability: In Stock - Usually ships in 1 to 2 days.

                Sterling GG gas heaters are an excellent option for heating garages, greenhouses, sheds, etc. Each Sterling GG heater includes: tubular heat exchanger, electronic ignition, power exhaust system, advanced diagnostic system for dependable worry-free operation, lots of safety features, high power fan to provide even heat distribution, rust-resistant aluminized steel exchanger, and a baked-on enamel finish made to protect them from harsh environments. Designed for propane or natural gas. Some...

                Sterling GG105 Gas Heater gg, gg105, sterling, gas, heater, unit, garage, greenhouse, propane, natural, fan, forced, sale, price, reviews, mr, dayton, big, maxx, heatstar, GG105A1NSA11, GG105A1PSA11, GG105A2NSA11, GG105A2PSA11, GG105A1NSB11, GG105A1PSB11, GG105A2NSB11, GG105A2PSB11
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                Price: $1,145.00
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                Availability: In Stock - Usually ships in 1 to 2 days.

                  Sterling GG gas heaters are an excellent option for heating garages, greenhouses, sheds, etc. Each Sterling GG heater includes: tubular heat exchanger, electronic ignition, power exhaust system, advanced diagnostic system for dependable worry-free operation, lots of safety features, high power fan to provide even heat distribution, rust-resistant aluminized steel exchanger, and a baked-on enamel finish made to protect them from harsh environments. Designed for propane or natural gas. Some...

                  Sterling GG120 Gas Heater gg120, gg, sterling, heater, gas, garage, shop, greenhouse, low, price, deal, sale, cheap, best, GG120A1NSA11, GG120A1PSA11, GG120A2NSA11, GG120A2PSA11, GG120A1NSB11, GG120A1PSB11, GG120A2NSB11, GG120A2PSB11
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                  Price: $1,199.00
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                  Availability: In Stock - Usually ships in 1 to 2 days.

                    Sterling GG gas heaters are an excellent option for heating garages, greenhouses, sheds, etc. Each Sterling GG heater includes: tubular heat exchanger, electronic ignition, power exhaust system, advanced diagnostic system for dependable worry-free operation, lots of safety features, high power fan to provide even heat distribution, rust-resistant aluminized steel exchanger, and a baked-on enamel finish made to protect them from harsh environments. Designed for propane or natural gas. Some...

                    Sterling GG60 Gas Heater gg60, gg, sterling, gas, natural, propane, heaters, garage, shop. greenhouses, sale, unit, low, price, GG060A1NSA11, GG060A1PSA11, GG060A2NSA11, GG060A2PSA11, GG060A1NSB11, GG060A1PSB11, GG060A2NSB11, GG060A2PSB11
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                    Price: $965.00
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                    Availability: In Stock - Usually ships in 1 to 2 days.

                      Sterling GG gas heaters are an excellent option for heating garages, greenhouses, sheds, etc. Each Sterling GG heater includes: tubular heat exchanger, electronic ignition, power exhaust system, advanced diagnostic system for dependable worry-free operation, lots of safety features, high power fan to provide even heat distribution, rust-resistant aluminized steel exchanger, and a baked-on enamel finish made to protect them from harsh environments. Designed for propane or natural gas. Some...

                      Sterling GG45 Gas Heater sterling, gg, gg45, gas, heater, furnace, garage, greenhouse, shop, unit, beacon, morris, cheap, sale, free, GG045A1NSA11, GG045A1PSA11, GG045A2NSA11, GG045A2PSA11
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                      Retail: $825.00
                      Price: $775.00
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                      Availability: In Stock - Usually ships in 1 to 2 days.

                        Sterling GG gas heaters are an excellent option for heating garages, greenhouses, sheds, etc. Each Sterling GG heater includes: tubular heat exchanger, electronic ignition, power exhaust system, advanced diagnostic system for dependable worry-free operation, lots of safety features, high power fan to provide even heat distribution, rust-resistant aluminized steel exchanger, and a baked-on enamel finish made to protect them from harsh environments. Designed for propane or natural gas. Some...

                        Sterling GG30 Gas Heater gg, sterling, gg30, gas, heater, shop, furnace, unit, sale, cheap, 30,000, BTU, greenhouse, fan, garage, GG030A1NSA11, GG030A1PSA11, GG030A2NSA11, GG030A2PSA11
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                        Price: $795.00
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                        Availability: In Stock - Usually ships in 1 to 2 days.

                          Sterling GG gas heaters are an excellent option for heating garages, greenhouses, sheds, etc. Each Sterling GG heater includes: tubular heat exchanger, electronic ignition, power exhaust system, advanced diagnostic system for dependable worry-free operation, lots of safety features, high power fan to provide even heat distribution, rust-resistant aluminized steel exchanger, and a baked-on enamel finish made to protect them from harsh environments. Designed for propane or natural gas. Some...

                          Gas Heater Category 3 Horizontal Vent Kits modine, heater, hd, hot, vent, kit, exhaust, category, 3, III, stainless, steel, UL, 1738, system venting, pipe, package, mr, big, maxx, MHU50, MHU80, MHU125, MHU, heatstar, enerco, dayton, lennox
                          Price: $269 - $305
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                          Availability: In Stock - Usually ships in 1 to 2 days.
                          Item #: 465010 -

                            Vent Size Compatible Gas Heaters 3 inch Modine Hot Dawg - HD30, HD45, HD60, & HD75 4 inch Modine Hot Dawg - HD100 & HD125   Mr. Heater / Big Maxx - MHU50, MHU80, MHU125   Reznor - UDX & UDZ (up to 125K BTU)   Dayton - Low profile unit heaters up to 120K BTU These universal heater exhaust kits come complete with everything needed to vent a gas heater up to 3' (additional pipe and/or a drip tee may be required for some units). These 3' stainless steel, gas tight, category 3 vent...

                            Modine Hot Dawg HD30 Gas Heaters  modine, hot, dawg, hd, dog, gas, heater, hd30, garage, shop, unit, greenhouse, propane, HD30AS0121, HD30AS0111, 4010110, 4010100
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                            Price: $849.00
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                              Modine Hot Dawg heaters are an affordable way to heat your garage, shop, greenhouse, or barn. Modine HD heaters feature direct spark ignition and low profile design. Each Hot Dawg heater includes: electronic ignition, power exhaust system, advanced diagnostic system for dependable worry-free operation, lots of safety features, high power fan to provide even heat distribution, rust-resistant aluminized steel exchanger, and a baked-on enamel finish made to protect the HD from harsh environments....

                              Modine Hot Dawg HD45 Gas Heaters modine, hot, dawg, hd, dog, gas, heater, hd45, garage, shop, unit, greenhouse, propane, HD45AS0121, HD45AS0111, 4010130, 4010120
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                              Price: $879.00
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                              Availability: In Stock - Usually ships in 1 to 2 days.

                                Modine Hot Dawg heaters are an affordable way to heat your garage, shop, greenhouse, or barn. Modine HD heaters feature direct spark ignition and low profile design. Each Hot Dawg heater includes: electronic ignition, power exhaust system, advanced diagnostic system for dependable worry-free operation, lots of safety features, high power fan to provide even heat distribution, rust-resistant aluminized steel exchanger, and a baked-on enamel finish made to protect the HD from harsh environments....

                                Modine Hot Dawg HD60 Gas Heaters modine, hot, dawg, hd, dog, gas, heater, hd60, garage, shop, unit, greenhouse, dang, HD60AS0111, HD60AS0121, 4010150, 4010140
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                                Price: $1,099.00
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                                Availability: In Stock - Usually ships in 1 to 2 days.

                                  Modine Hot Dawg heaters are an affordable way to heat your garage, shop, greenhouse, or barn. Modine HD heaters feature direct spark ignition and low profile design. Each Hot Dawg heater includes: electronic ignition, power exhaust system, advanced diagnostic system for dependable worry-free operation, lots of safety features, high power fan to provide even heat distribution, rust-resistant aluminized steel exchanger, and a baked-on enamel finish made to protect the HD from harsh environments....

                                  Modine Hot Dawg HD75 Gas Heaters modine, hot, dawg, hd, dog, gas, heater, hd75, garage, shop, unit, greenhouse, dang, HD75AS0111, HD75AS0121, 4010170, 4010160
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                                  Price: $1,139.00
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                                  Availability: In Stock - Usually ships in 1 to 2 days.

                                    Modine Hot Dawg heaters are an affordable way to heat your garage, shop, greenhouse, or barn. Modine HD heaters feature direct spark ignition and low profile design. Each Hot Dawg heater includes: electronic ignition, power exhaust system, advanced diagnostic system for dependable worry-free operation, lots of safety features, high power fan to provide even heat distribution, rust-resistant aluminized steel exchanger, and a baked-on enamel finish made to protect the HD from harsh environments....

                                    Modine Hot Dawg HD100 Gas Heaters modine, hot, dawg, hd, dog, gas, heater, hd100, garage, shop, unit, greenhouse, dang, HD100AS0121, HD100AS0111, 4010180, 4010185
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                                    Price: $1,295.00
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                                    Availability: In Stock - Usually ships in 1 to 2 days.

                                      Modine Hot Dawg heaters are an affordable way to heat your garage, shop, greenhouse, or barn. Modine HD heaters feature direct spark ignition and low profile design. Each Hot Dawg heater includes: electronic ignition, power exhaust system, advanced diagnostic system for dependable worry-free operation, lots of safety features, high power fan to provide even heat distribution, rust-resistant aluminized steel exchanger, and a baked-on enamel finish made to protect the HD from harsh environments....

                                      Modine Hot Dawg HD125 Gas Heaters modine, hot, dawg, hd, dog, gas, heater, hd125, garage, shop, unit, greenhouse, propane, natural, HD125AS0111, HD125AS0121, 4010190, 4010195
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                                      Price: $1,379.00
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                                      Availability: In Stock - Usually ships in 1 to 2 days.

                                        Modine Hot Dawg heaters are an affordable way to heat your garage, shop, greenhouse, or barn. Modine HD heaters feature direct spark ignition and low profile design. Each Hot Dawg heater includes: electronic ignition, power exhaust system, advanced diagnostic system for dependable worry-free operation, lots of safety features, high power fan to provide even heat distribution, rust-resistant aluminized steel exchanger, and a baked-on enamel finish made to protect the HD from harsh environments....

                                        Universal 24v Gas Heater Control Valves gas, control, valve, direct, spark, hot, surface, intermittent, pilot, low, voltage, 24, modine, sterling, universal, replacement, conversion, propane, natural, ignition
                                        Price: $95 - $229
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                                        Availability: In Stock - Usually ships in 1 to 2 days.
                                        Item #: 40360 -

                                          These universal gas valves are used in Modine, Sterling, Beacon Morris, Dayton, and other gas unit heaters that have automatic electronic ignition whether it be direct spark, hot surface, or intermittent pilot (Not for use with standing pilot systems). Each valve comes setup for natural gas and includes propane conversion kit and 1/2" pipe reducers for the 3/4" valves which allow them to be used with smaller gas connections. The White Rodgers 1/2" x 1/2" universal gas control valve is for gas...

                                          Modine Heater Conversion to Natural Gas Kits PA, BA, pae, pv, pd, pdp, modine, part, heater, gas, model, replacement, conversion, kit, natural
                                          Price: $89 - $105
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                                          Availability: In Stock - Usually ships in 2 to 3 days.
                                          Item #: 4045205 -

                                            These kits include all parts needed to convert Modine PA, PAE, PV, PD & PDP 30-400 heaters from propane (LP) to natural gas (NG). You will need to specify the brand of gas valve on your heater to receive the proper conversion kit. Pictures are shown below. Modine Conversion Kits Include Main burner orifice(s)Pilot orifice(s)Conversion spring kit for the gas valve on the heaterInstallation instructions Additional gas valve conversion spring kits are available if needed. We also offer Propane...

                                            Sterling Heater Gas Valves sterling, part, gas, valve, heater, gg, tf, xf, propane, natural, 24, volt, direct, spark, single, stage, 4075520, 4075530, 4075355, 4075357
                                            Price: $145 - $199
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                                            Availability: In Stock - Usually ships in 1 to 2 days.
                                            Item #: 407 -

                                              Replacement Sterling gas valves for GG and TF unit heaters. All valves are 24v, single stage, and designed for direct spark ignition systems. Sterling Part # Fits Sterling Models J28R06892-00111J28R06892-001Natural Gas TF030, TF045, TF060, TF075, TF090, TF100, TF125, TF150, TF175, TF200, RF030, RF045, RF060, RF075, RF090, SF030, SF045, SF060, SF075, GG030, GG045, GG060, GG075, GG090, GG105, GG120, SF100, SF125, SF150, SF175, SF200, TC100, TC125, TC150, TC175, TC200, SC100, SC125, SC150, SC175,...

                                              Sterling XF150 Gas Unit Heater  sterling, xf150, tf150, heater, gas, propane, tf, furnace, greenhouse, shop, natural, dayton, beacon, morris
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                                              Price: $1,425.00
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                                              Availability: In Stock - Usually ships in 2 to 4 days.

                                                - Replaces Sterling TF150 and SF150 heaters - The Sterling XF series gas unit heaters replace the TF and SF series heaters and combine them into one unit that can be vented as standard open combustion (Exhaust pipe only) or separated combustion (Using both an exhaust and intake pipe). They are a great heating option for large greenhouses, warehouses, commercial structures, etc. Sterling XF heaters feature: tubular heat exchanger, power exhaust system, electronic ignition, advanced diagnostic...

                                                Sterling XF175 Gas Unit Heater sterling, xf175, tf175, heater, gas, propane, tf, furnace, greenhouse, shop, natural, dayton, beacon, morris
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                                                Price: $1,599.00
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                                                Availability: In Stock - Usually ships in 2 to 4 days.

                                                  - Replaces Sterling TF175 and SF175 heaters - The Sterling XF series gas unit heaters replace the TF and SF series heaters and combine them into one unit that can be vented as standard open combustion (Exhaust pipe only) or separated combustion (Using both an exhaust and intake pipe). They are a great heating option for large greenhouses, warehouses, commercial structures, etc. Sterling XF heaters feature: tubular heat exchanger, power exhaust system, electronic ignition, advanced diagnostic...