{"product_id":"dometic™-dfmdh25121-rv-furnace-25-000-btu-lp-gas-bottom-discharge-12v-dc","title":"Dometic™ DFMDH25121 RV Furnace – 25,000 BTU – LP Gas – Bottom Discharge – 12V DC","description":"\u003ch1\u003eDometic™ DFMDH25121 RV Furnace – 25,000 BTU – LP Gas – Bottom Discharge – 12V DC\u003c\/h1\u003e\n\u003cp\u003e\u003cstrong\u003eDFM Series | Hall Effect Sensor Model | Doorless Design | Medium Size\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eModel:\u003c\/strong\u003e DFMDH25121\u003cbr\u003e\u003cstrong\u003eSeries:\u003c\/strong\u003e DFM “H” Series\u003cbr\u003e\u003cstrong\u003eFuel Type:\u003c\/strong\u003e LP Gas (Propane)\u003cbr\u003e\u003cstrong\u003eBTU Output:\u003c\/strong\u003e 25,000 BTU\u003cbr\u003e\u003cstrong\u003eStage:\u003c\/strong\u003e Single Stage\u003cbr\u003e\u003cstrong\u003eVoltage:\u003c\/strong\u003e 12 Volt DC\u003cbr\u003e\u003cstrong\u003eDischarge Type:\u003c\/strong\u003e Bottom Discharge\u003cbr\u003e\u003cstrong\u003eThermostat Sold Separately\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eExterior Door Not Included (Doorless Model)\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cstrong\u003e2-Year Limited Manufacturer Warranty\u003c\/strong\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003eProduct Overview\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eDometic™ DFMDH25121\u003c\/strong\u003e is a \u003cstrong\u003e25,000 BTU LP gas RV furnace\u003c\/strong\u003e from the advanced \u003cstrong\u003eDFM “H” Series\u003c\/strong\u003e, featuring an \u003cstrong\u003eelectronic Hall Effect airflow sensor\u003c\/strong\u003e and \u003cstrong\u003ebuilt-in Soft Start technology\u003c\/strong\u003e for improved electrical startup performance.\u003c\/p\u003e\n\u003cp\u003eThis version is a \u003cstrong\u003edoorless heater model\u003c\/strong\u003e, meaning \u003cstrong\u003ean exterior access door is not required\u003c\/strong\u003e for installation. Instead, service and access are performed from inside the RV or living space.\u003c\/p\u003e\n\u003cp\u003eThis doorless configuration makes the DFMDH25121 especially well-suited for:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eVans and van conversions\u003c\/li\u003e\n\u003cli\u003eSmall travel trailers\u003c\/li\u003e\n\u003cli\u003eTruck campers\u003c\/li\u003e\n\u003cli\u003eIce fishing houses\u003c\/li\u003e\n\u003cli\u003eCustom RV layouts with limited exterior wall space\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eBefore ordering, always \u003cstrong\u003emeasure your existing furnace cut-out\u003c\/strong\u003e to ensure the unit will fit properly within your available space.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e25,000 BTU heating capacity\u003c\/li\u003e\n\u003cli\u003eLP gas (propane) operation\u003c\/li\u003e\n\u003cli\u003eSingle-stage heating performance\u003c\/li\u003e\n\u003cli\u003eBottom discharge airflow configuration\u003c\/li\u003e\n\u003cli\u003e12 Volt DC operation\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eHall Effect airflow sensor (no mechanical sail switch)\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003eBuilt-in Soft Start for reduced electrical surge\u003c\/li\u003e\n\u003cli\u003eDoorless design (no exterior access door required)\u003c\/li\u003e\n\u003cli\u003eIdeal for compact or custom installs\u003c\/li\u003e\n\u003cli\u003eThermostat sold separately\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eModel:\u003c\/strong\u003e DFMDH25121\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeries:\u003c\/strong\u003e DFM H Series\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBTU Rating:\u003c\/strong\u003e 25,000 BTU\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFuel Type:\u003c\/strong\u003e LP Gas (Propane)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeating Stage:\u003c\/strong\u003e Single Stage\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVoltage:\u003c\/strong\u003e 12 Volt DC\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDischarge Configuration:\u003c\/strong\u003e Bottom\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWidth:\u003c\/strong\u003e 16-1\/2 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeight:\u003c\/strong\u003e 7 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDepth:\u003c\/strong\u003e 20 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAirflow Monitoring:\u003c\/strong\u003e Hall Effect Sensor\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSoft Start Technology:\u003c\/strong\u003e Yes\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExterior Access Door:\u003c\/strong\u003e Not Required\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThermostat Included:\u003c\/strong\u003e No\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch2\u003eDoorless Installation – Pros \u0026amp; Cons\u003c\/h2\u003e\n\u003ch3\u003e\u003cstrong\u003eDoorless Design Benefits\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eNo large exterior cut-out required\u003c\/strong\u003e — perfect for vans, truck campers, tiny houses, and custom builds.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlexible placement\u003c\/strong\u003e — this furnace can be mounted in multiple orientations and locations.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSimplified installation\u003c\/strong\u003e — fewer exterior modifications needed.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClean RV exterior\u003c\/strong\u003e — no visible furnace access door on the sidewall.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eConsiderations (Cons)\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eInterior access required for servicing\u003c\/strong\u003e — you must remove ceiling panels or interior trim to reach the furnace.\u003c\/li\u003e\n\u003cli\u003eNot ideal if you want \u003cstrong\u003eexternal maintenance access\u003c\/strong\u003e without entering the RV.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThis design trade-off makes the DFMDH25121 one of the \u003cstrong\u003emost adaptable furnace solutions\u003c\/strong\u003e for non-traditional RV builds and limited exterior wall applications.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003eWhy Choose This Model?\u003c\/h2\u003e\n\u003cp\u003eThe DFMDH25121 combines traditional propane furnace power with modern electronics and installation flexibility. Key advantages include:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eHall Effect sensing for reliable ignition\u003c\/li\u003e\n\u003cli\u003eSoft Start technology for reduced electrical demand\u003c\/li\u003e\n\u003cli\u003eCompact footprint for tight installations\u003c\/li\u003e\n\u003cli\u003eNo need for an exterior access door\u003c\/li\u003e\n\u003cli\u003eIdeal for custom RV, overland, or conversion projects\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch2\u003eFrequently Asked Questions (FAQ)\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What does “Hall Effect sensor” mean?\u003c\/strong\u003e\u003cbr\u003eA: The Hall Effect system electronically verifies blower airflow by detecting motor rotation, eliminating the need for a mechanical sail switch.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Why is this model “doorless”?\u003c\/strong\u003e\u003cbr\u003eA: It’s designed to install without an exterior furnace access door — perfect when you don’t want or can’t cut a large hole through your sidewall.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Where do I service the furnace?\u003c\/strong\u003e\u003cbr\u003eA: From inside the RV; panels or trim must be removed to access the heater for service.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Does this include a thermostat?\u003c\/strong\u003e\u003cbr\u003eA: No. A compatible 12V furnace thermostat must be purchased separately.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Will this fit a standard furnace cut-out?\u003c\/strong\u003e\u003cbr\u003eA: It uses the same footprint as other 25,000 BTU DFM models, but always \u003cstrong\u003emeasure your cut-out\u003c\/strong\u003e before ordering.\u003c\/p\u003e","brand":"RV Furnace Guys","offers":[{"title":"Default Title","offer_id":47857597939953,"sku":null,"price":1199.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0784\/4941\/0289\/files\/251211.png?v=1772399406","url":"https:\/\/www.rvfurnaceparts.com\/products\/dometic%e2%84%a2-dfmdh25121-rv-furnace-25-000-btu-lp-gas-bottom-discharge-12v-dc","provider":"RV Furnace Guys","version":"1.0","type":"link"}