{"product_id":"dometic-dfmdh25111-25-000-btu-lp-furnace","title":"Dometic DFMDH25111 25,000 BTU LP Gas Furnace","description":"\u003cp class=\"nvn-hero\"\u003eThe Dometic DFMDH25111 is a 25,000 BTU LP gas furnace built for RVs, trailers, and small cabins. Single-stage operation and a fan-forced blower push warm, ducted air out the bottom discharge, so cold mornings on the road turn comfortable fast.\u003c\/p\u003e\n\n\u003cdiv class=\"nvn-description\"\u003e\n\u003cp\u003eWhen the temperature drops and you're parked somewhere quiet, you want heat that just works. The Dometic DFMDH25111 is a 25,000 BTU LP gas furnace designed to do exactly that. It's a single-stage, fan-forced unit that burns propane and pushes warm air through your rig's ductwork, making it a dependable choice for RVs, travel trailers, fifth wheels, and compact cabins that need real heating output without a lot of fuss.\u003c\/p\u003e\n\u003cp\u003eThe 25,000 BTU input rating puts this furnace in the sweet spot for mid-size coaches and trailers. It's enough muscle to warm a living space quickly on a frosty morning, yet it isn't so oversized that it short-cycles in a smaller floor plan. Single-stage operation keeps the design simple and reliable. The burner fires at one consistent output, the blower moves the heated air, and your thermostat handles the rest. Fewer moving parts and fewer failure points mean more nights of steady warmth.\u003c\/p\u003e\n\u003cp\u003eAir delivery is bottom discharge, which suits floor-mounted installations where the warm air needs to travel down and out into ducted runs. The fan-forced blower does the heavy lifting, distributing heat evenly instead of letting it pool near the unit. That even spread is what keeps the far end of a coach comfortable rather than roasting the space right in front of the register. This model, the DFMDH25111, includes the exterior access door variant, giving you a clean finished look at the sidewall vent.\u003c\/p\u003e\n\u003cp\u003eDometic engineered this furnace around a sealed combustion chamber, so the air it burns comes from outside the living space and the exhaust goes back outside. That separation is important. It means the heat you feel indoors is clean, forced air, while combustion byproducts stay isolated from where you sleep and breathe. Direct spark ignition lights the burner automatically each time the thermostat calls for heat, so there's no standing pilot to relight and no wasted fuel between cycles.\u003c\/p\u003e\n\u003cp\u003eSafety is layered into the design. A sail switch confirms the blower is actually moving air before the burner fires, and a high-limit switch shuts the burner down if temperatures ever climb past the safe range. Together they make sure the furnace only runs when everything is working the way it should. The unit operates on 12V DC power, drawing roughly 7.5 amps while running, which keeps it friendly to your house battery and compatible with standard 12-volt RV thermostats you may already have installed.\u003c\/p\u003e\n\u003cp\u003ePhysically, the DFMDH25111 is built to drop into common furnace bays. It measures about 16.5 inches wide, 7 inches tall, and 20 inches deep, and weighs around 34 pounds, so a single installer can maneuver it into place. If you're replacing an aging unit, that compact footprint and ducted, bottom-discharge layout make it a natural fit for a lot of existing installations.\u003c\/p\u003e\n\u003cp\u003eDometic has been building comfort and climate equipment for the mobile lifestyle for decades, and that experience shows in how this furnace is put together. It's the kind of component you install once and stop thinking about, which is exactly what you want from your heat source when you're miles from the nearest service center. Whether you're chasing shoulder-season camping, living in your rig full-time, or just want reliable warmth on the occasional cold snap, the DFMDH25111 delivers steady, ducted propane heat you can count on.\u003c\/p\u003e\n\u003cp\u003eIf you need more output for a larger coach, Dometic offers a 30,000 BTU version in the same family, and there's a doorless 25,000 BTU variant as well. But for a lot of RVers, this 25,000 BTU doored model hits the balance of power, efficiency, and easy installation just right. Pair it with a compatible thermostat, connect it to your existing LP supply and ductwork, and you've got a heat source ready for years of cold nights, early spring trips, and late fall getaways when everyone else has already packed up and gone home.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul class=\"nvn-features\"\u003e\n  \u003cli\u003e25,000 BTU input rating for mid-size RVs, trailers, and compact cabins\u003c\/li\u003e\n  \u003cli\u003eSingle-stage LP gas operation for simple, reliable heating\u003c\/li\u003e\n  \u003cli\u003eFan-forced blower with bottom discharge for even, ducted air distribution\u003c\/li\u003e\n  \u003cli\u003eSealed combustion chamber keeps burn air and exhaust separate from living space\u003c\/li\u003e\n  \u003cli\u003eDirect spark ignition, no standing pilot to relight\u003c\/li\u003e\n  \u003cli\u003eSail switch and high-limit switch for layered safety\u003c\/li\u003e\n  \u003cli\u003e12V DC operation drawing about 7.5 amps, easy on the house battery\u003c\/li\u003e\n  \u003cli\u003eCompatible with standard 12-volt RV thermostats\u003c\/li\u003e\n  \u003cli\u003eExterior access door variant for a clean finished sidewall look\u003c\/li\u003e\n  \u003cli\u003eCompact 16.5 x 7 x 20 inch body weighing roughly 34 pounds\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cdiv class=\"nvn-trust\"\u003e\n  \u003ch2\u003eWhy Buy from NVN Marine\u003c\/h2\u003e\n  \u003cul\u003e\n    \u003cli\u003eAuthorized Dometic reseller, full manufacturer warranty\u003c\/li\u003e\n    \u003cli\u003eNMEA member and ABYC certified, advice from real boat techs\u003c\/li\u003e\n    \u003cli\u003eSame-day shipping before 3 PM ET on in-stock items\u003c\/li\u003e\n    \u003cli\u003eNY headquarters and Fort Lauderdale flagship retail store\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cdiv class=\"nvn-faq\"\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eHow many BTUs does the DFMDH25111 put out?\u003c\/summary\u003e\n    \u003cp\u003eIt's rated at 25,000 BTU input. That's a strong match for mid-size RVs, travel trailers, fifth wheels, and small cabins, giving you quick, steady warmth without being oversized for the space.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat fuel does this furnace use?\u003c\/summary\u003e\n    \u003cp\u003eThe DFMDH25111 runs on LP gas, also known as propane. It draws combustion air from outside through its sealed chamber and vents exhaust back outside, so the heated air circulating indoors stays clean forced air.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eIs this a single-stage or two-stage furnace?\u003c\/summary\u003e\n    \u003cp\u003eIt's single-stage. The burner fires at one consistent output and the thermostat cycles it on and off to hold your set temperature. That simplicity means fewer parts and dependable performance.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat does bottom discharge mean for installation?\u003c\/summary\u003e\n    \u003cp\u003eBottom discharge means the warm air exits the lower portion of the unit, which suits floor-mounted furnace bays where heated air feeds down into ducted runs. It's a common layout in RV and trailer installations.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eHow much power does it draw and what does it run on?\u003c\/summary\u003e\n    \u003cp\u003eThe furnace operates on 12V DC and pulls roughly 7.5 amps while running. It works with standard 12-volt RV thermostats, so in many cases you can keep the controls you already have.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat are the dimensions and weight?\u003c\/summary\u003e\n    \u003cp\u003eIt measures about 16.5 inches wide, 7 inches tall, and 20 inches deep, and weighs around 34 pounds. That compact footprint fits many existing furnace bays and lets one person handle the install.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eHow does the DFMDH25111 differ from the DFMDH25121?\u003c\/summary\u003e\n    \u003cp\u003eBoth are 25,000 BTU single-stage bottom-discharge furnaces. The DFMDH25111 is the exterior-door variant, while the DFMDH25121 is the doorless version. If you want more output, the DFMDH30121 steps up to 30,000 BTU.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat safety features does it include?\u003c\/summary\u003e\n    \u003cp\u003eA sail switch confirms the blower is moving air before the burner lights, and a high-limit switch shuts the burner down if temperatures climb too high. Direct spark ignition also means there's no standing pilot flame.\u003c\/p\u003e\n  \u003c\/details\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003ctable class=\"nvn-specs\"\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003cth\u003eTitle\u003c\/th\u003e\n\u003ctd\u003eDometic DFMDH25111 25,000 BTU LP Gas Furnace\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eBrand\u003c\/th\u003e\n\u003ctd\u003eDometic\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eManufacturer Part Number\u003c\/th\u003e\n\u003ctd\u003eDFMDH25111\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eUPC\u003c\/th\u003e\n\u003ctd\u003e7315091573863\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eProduct Type\u003c\/th\u003e\n\u003ctd\u003eRV LP Gas Furnace\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eBTU Input Rating\u003c\/th\u003e\n\u003ctd\u003e25,000 BTU\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eFuel Type\u003c\/th\u003e\n\u003ctd\u003eLP Gas (Propane)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eStage\u003c\/th\u003e\n\u003ctd\u003eSingle Stage\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eAir Discharge\u003c\/th\u003e\n\u003ctd\u003eBottom Discharge\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eAir Delivery\u003c\/th\u003e\n\u003ctd\u003eFan-Forced Blower\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eIgnition\u003c\/th\u003e\n\u003ctd\u003eDirect Spark\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eCombustion\u003c\/th\u003e\n\u003ctd\u003eSealed Combustion Chamber\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003ePower\u003c\/th\u003e\n\u003ctd\u003e12V DC, approximately 7.5 amps\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eThermostat\u003c\/th\u003e\n\u003ctd\u003eStandard 12-volt RV thermostat compatible\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eSafety Controls\u003c\/th\u003e\n\u003ctd\u003eSail switch and high-limit switch\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eDoor Variant\u003c\/th\u003e\n\u003ctd\u003eExterior access door\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eDimensions\u003c\/th\u003e\n\u003ctd\u003e16.5 in W x 7 in H x 20 in D\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eWeight\u003c\/th\u003e\n\u003ctd\u003eApproximately 34 lbs\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e\n{\n    \"@context\": \"https:\/\/schema.org\",\n    \"@type\": \"FAQPage\",\n    \"mainEntity\": [\n        {\n            \"@type\": \"Question\",\n            \"name\": \"How many BTUs does the DFMDH25111 put out?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"It's rated at 25,000 BTU input. That's a strong match for mid-size RVs, travel trailers, fifth wheels, and small cabins, giving you quick, steady warmth without being oversized for the space.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"What fuel does this furnace use?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"The DFMDH25111 runs on LP gas, also known as propane. It draws combustion air from outside through its sealed chamber and vents exhaust back outside, so the heated air circulating indoors stays clean forced air.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Is this a single-stage or two-stage furnace?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"It's single-stage. The burner fires at one consistent output and the thermostat cycles it on and off to hold your set temperature. That simplicity means fewer parts and dependable performance.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"What does bottom discharge mean for installation?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Bottom discharge means the warm air exits the lower portion of the unit, which suits floor-mounted furnace bays where heated air feeds down into ducted runs. It's a common layout in RV and trailer installations.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"How much power does it draw and what does it run on?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"The furnace operates on 12V DC and pulls roughly 7.5 amps while running. It works with standard 12-volt RV thermostats, so in many cases you can keep the controls you already have.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"What are the dimensions and weight?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"It measures about 16.5 inches wide, 7 inches tall, and 20 inches deep, and weighs around 34 pounds. That compact footprint fits many existing furnace bays and lets one person handle the install.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"How does the DFMDH25111 differ from the DFMDH25121?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Both are 25,000 BTU single-stage bottom-discharge furnaces. The DFMDH25111 is the exterior-door variant, while the DFMDH25121 is the doorless version. If you want more output, the DFMDH30121 steps up to 30,000 BTU.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"What safety features does it include?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"A sail switch confirms the blower is moving air before the burner lights, and a high-limit switch shuts the burner down if temperatures climb too high. Direct spark ignition also means there's no standing pilot flame.\"\n            }\n        }\n    ]\n}\n\u003c\/script\u003e\n","brand":"Dometic","offers":[{"title":"Default Title","offer_id":44782622900317,"sku":"2006763","price":1282.49,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0299\/7266\/0317\/files\/ImageServerAPI_0259b6c1-1a7e-4f63-958f-d248c255e694.png?v=1784853659","url":"https:\/\/nvnmarine.com\/products\/dometic-dfmdh25111-25-000-btu-lp-furnace","provider":"NVN Marine","version":"1.0","type":"link"}