{"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 data-end=\"291\" data-start=\"207\"\u003eDometic™ DFMDH25121 RV Furnace – 25,000 BTU – LP Gas – Bottom Discharge – 12V DC\u003c\/h1\u003e\n\u003cp data-end=\"365\" data-start=\"292\"\u003e\u003cstrong data-end=\"365\" data-start=\"292\"\u003eDFM Series | Hall Effect Sensor Model | Doorless Design | Medium Size\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-end=\"654\" data-start=\"367\"\u003e\u003cstrong data-end=\"377\" data-start=\"367\"\u003eModel:\u003c\/strong\u003e DFMDH25121\u003cbr data-end=\"391\" data-start=\"388\"\u003e\u003cstrong data-end=\"402\" data-start=\"391\"\u003eSeries:\u003c\/strong\u003e DFM “H” Series\u003cbr data-end=\"420\" data-start=\"417\"\u003e\u003cstrong data-end=\"434\" data-start=\"420\"\u003eFuel Type:\u003c\/strong\u003e LP Gas (Propane)\u003cbr data-end=\"454\" data-start=\"451\"\u003e\u003cstrong data-end=\"469\" data-start=\"454\"\u003eBTU Output:\u003c\/strong\u003e 25,000 BTU\u003cbr data-end=\"483\" data-start=\"480\"\u003e\u003cstrong data-end=\"493\" data-start=\"483\"\u003eStage:\u003c\/strong\u003e Single Stage\u003cbr data-end=\"509\" data-start=\"506\"\u003e\u003cstrong data-end=\"521\" data-start=\"509\"\u003eVoltage:\u003c\/strong\u003e 12 Volt DC\u003cbr data-end=\"535\" data-start=\"532\"\u003e\u003cstrong data-end=\"554\" data-start=\"535\"\u003eDischarge Type:\u003c\/strong\u003e Bottom Discharge\u003cbr data-end=\"574\" data-start=\"571\"\u003e\u003cstrong data-end=\"604\" data-start=\"574\"\u003eThermostat Sold Separately\u003c\/strong\u003e\u003cbr data-end=\"607\" data-start=\"604\"\u003e\u003cstrong data-end=\"654\" data-start=\"607\"\u003eExterior Door Not Included (Doorless Model)\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-end=\"654\" data-start=\"367\"\u003e\u003cstrong data-end=\"654\" data-start=\"607\"\u003e\u003cstrong data-end=\"690\" data-start=\"660\"\u003e2-Year Limited Manufacturer Warranty\u003c\/strong\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003chr data-end=\"659\" data-start=\"656\"\u003e\n\u003ch2 data-end=\"680\" data-start=\"661\"\u003eProduct Overview\u003c\/h2\u003e\n\u003cp data-end=\"924\" data-start=\"682\"\u003eThe \u003cstrong data-end=\"709\" data-start=\"686\"\u003eDometic™ DFMDH25121\u003c\/strong\u003e is a \u003cstrong data-end=\"747\" data-start=\"715\"\u003e25,000 BTU LP gas RV furnace\u003c\/strong\u003e from the advanced \u003cstrong data-end=\"784\" data-start=\"766\"\u003eDFM “H” Series\u003c\/strong\u003e, featuring an \u003cstrong data-end=\"840\" data-start=\"799\"\u003eelectronic Hall Effect airflow sensor\u003c\/strong\u003e and \u003cstrong data-end=\"879\" data-start=\"845\"\u003ebuilt-in Soft Start technology\u003c\/strong\u003e for improved electrical startup performance.\u003c\/p\u003e\n\u003cp data-end=\"1118\" data-start=\"926\"\u003eThis version is a \u003cstrong data-end=\"969\" data-start=\"944\"\u003edoorless heater model\u003c\/strong\u003e, meaning \u003cstrong data-end=\"1022\" data-start=\"979\"\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 data-end=\"1196\" data-start=\"1120\"\u003eThis doorless configuration makes the DFMDH25121 especially well-suited for:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli data-end=\"1225\" data-start=\"1199\"\u003eVans and van conversions\u003c\/li\u003e\n\u003cli data-end=\"1251\" data-start=\"1228\"\u003eSmall travel trailers\u003c\/li\u003e\n\u003cli data-end=\"1269\" data-start=\"1254\"\u003eTruck campers\u003c\/li\u003e\n\u003cli data-end=\"1292\" data-start=\"1272\"\u003eIce fishing houses\u003c\/li\u003e\n\u003cli data-end=\"1347\" data-start=\"1295\"\u003eCustom RV layouts with limited exterior wall space\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-end=\"1480\" data-start=\"1349\"\u003eBefore ordering, always \u003cstrong data-end=\"1414\" data-start=\"1373\"\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 data-end=\"1485\" data-start=\"1482\"\u003e\n\u003ch2 data-end=\"1502\" data-start=\"1487\"\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli data-end=\"1535\" data-start=\"1506\"\u003e25,000 BTU heating capacity\u003c\/li\u003e\n\u003cli data-end=\"1566\" data-start=\"1538\"\u003eLP gas (propane) operation\u003c\/li\u003e\n\u003cli data-end=\"1603\" data-start=\"1569\"\u003eSingle-stage heating performance\u003c\/li\u003e\n\u003cli data-end=\"1646\" data-start=\"1606\"\u003eBottom discharge airflow configuration\u003c\/li\u003e\n\u003cli data-end=\"1671\" data-start=\"1649\"\u003e12 Volt DC operation\u003c\/li\u003e\n\u003cli data-end=\"1734\" data-start=\"1674\"\u003e\u003cstrong data-end=\"1732\" data-start=\"1674\"\u003eHall Effect airflow sensor (no mechanical sail switch)\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli data-end=\"1787\" data-start=\"1737\"\u003eBuilt-in Soft Start for reduced electrical surge\u003c\/li\u003e\n\u003cli data-end=\"1842\" data-start=\"1790\"\u003eDoorless design (no exterior access door required)\u003c\/li\u003e\n\u003cli data-end=\"1883\" data-start=\"1845\"\u003eIdeal for compact or custom installs\u003c\/li\u003e\n\u003cli data-end=\"1914\" data-start=\"1886\"\u003eThermostat sold separately\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-end=\"1919\" data-start=\"1916\"\u003e\n\u003ch2 data-end=\"1938\" data-start=\"1921\"\u003eSpecifications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli data-end=\"1965\" data-start=\"1942\"\u003e\n\u003cstrong data-end=\"1952\" data-start=\"1942\"\u003eModel:\u003c\/strong\u003e DFMDH25121\u003c\/li\u003e\n\u003cli data-end=\"1994\" data-start=\"1968\"\u003e\n\u003cstrong data-end=\"1979\" data-start=\"1968\"\u003eSeries:\u003c\/strong\u003e DFM H Series\u003c\/li\u003e\n\u003cli data-end=\"2025\" data-start=\"1997\"\u003e\n\u003cstrong data-end=\"2012\" data-start=\"1997\"\u003eBTU Rating:\u003c\/strong\u003e 25,000 BTU\u003c\/li\u003e\n\u003cli data-end=\"2061\" data-start=\"2028\"\u003e\n\u003cstrong data-end=\"2042\" data-start=\"2028\"\u003eFuel Type:\u003c\/strong\u003e LP Gas (Propane)\u003c\/li\u003e\n\u003cli data-end=\"2097\" data-start=\"2064\"\u003e\n\u003cstrong data-end=\"2082\" data-start=\"2064\"\u003eHeating Stage:\u003c\/strong\u003e Single Stage\u003c\/li\u003e\n\u003cli data-end=\"2125\" data-start=\"2100\"\u003e\n\u003cstrong data-end=\"2112\" data-start=\"2100\"\u003eVoltage:\u003c\/strong\u003e 12 Volt DC\u003c\/li\u003e\n\u003cli data-end=\"2165\" data-start=\"2128\"\u003e\n\u003cstrong data-end=\"2156\" data-start=\"2128\"\u003eDischarge Configuration:\u003c\/strong\u003e Bottom\u003c\/li\u003e\n\u003cli data-end=\"2194\" data-start=\"2168\"\u003e\n\u003cstrong data-end=\"2178\" data-start=\"2168\"\u003eWidth:\u003c\/strong\u003e 16-1\/2 inches\u003c\/li\u003e\n\u003cli data-end=\"2219\" data-start=\"2197\"\u003e\n\u003cstrong data-end=\"2208\" data-start=\"2197\"\u003eHeight:\u003c\/strong\u003e 7 inches\u003c\/li\u003e\n\u003cli data-end=\"2244\" data-start=\"2222\"\u003e\n\u003cstrong data-end=\"2232\" data-start=\"2222\"\u003eDepth:\u003c\/strong\u003e 20 inches\u003c\/li\u003e\n\u003cli data-end=\"2291\" data-start=\"2247\"\u003e\n\u003cstrong data-end=\"2270\" data-start=\"2247\"\u003eAirflow Monitoring:\u003c\/strong\u003e Hall Effect Sensor\u003c\/li\u003e\n\u003cli data-end=\"2326\" data-start=\"2294\"\u003e\n\u003cstrong data-end=\"2320\" data-start=\"2294\"\u003eSoft Start Technology:\u003c\/strong\u003e Yes\u003c\/li\u003e\n\u003cli data-end=\"2369\" data-start=\"2329\"\u003e\n\u003cstrong data-end=\"2354\" data-start=\"2329\"\u003eExterior Access Door:\u003c\/strong\u003e Not Required\u003c\/li\u003e\n\u003cli data-end=\"2401\" data-start=\"2372\"\u003e\n\u003cstrong data-end=\"2396\" data-start=\"2372\"\u003eThermostat Included:\u003c\/strong\u003e No\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-end=\"2406\" data-start=\"2403\"\u003e\n\u003ch2 data-end=\"2446\" data-start=\"2408\"\u003eDoorless Installation – Pros \u0026amp; Cons\u003c\/h2\u003e\n\u003ch3 data-end=\"2483\" data-start=\"2448\"\u003e\u003cstrong data-end=\"2483\" data-start=\"2455\"\u003eDoorless Design Benefits\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli data-end=\"2593\" data-start=\"2486\"\u003e\n\u003cstrong data-end=\"2524\" data-start=\"2486\"\u003eNo large exterior cut-out required\u003c\/strong\u003e — perfect for vans, truck campers, tiny houses, and custom builds.\u003c\/li\u003e\n\u003cli data-end=\"2690\" data-start=\"2596\"\u003e\n\u003cstrong data-end=\"2618\" data-start=\"2596\"\u003eFlexible placement\u003c\/strong\u003e — this furnace can be mounted in multiple orientations and locations.\u003c\/li\u003e\n\u003cli data-end=\"2761\" data-start=\"2693\"\u003e\n\u003cstrong data-end=\"2720\" data-start=\"2693\"\u003eSimplified installation\u003c\/strong\u003e — fewer exterior modifications needed.\u003c\/li\u003e\n\u003cli data-end=\"2835\" data-start=\"2764\"\u003e\n\u003cstrong data-end=\"2785\" data-start=\"2764\"\u003eClean RV exterior\u003c\/strong\u003e — no visible furnace access door on the sidewall.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-end=\"2868\" data-start=\"2837\"\u003e\u003cstrong data-end=\"2868\" data-start=\"2843\"\u003eConsiderations (Cons)\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli data-end=\"2987\" data-start=\"2871\"\u003e\n\u003cstrong data-end=\"2913\" data-start=\"2871\"\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 data-end=\"3070\" data-start=\"2990\"\u003eNot ideal if you want \u003cstrong data-end=\"3043\" data-start=\"3012\"\u003eexternal maintenance access\u003c\/strong\u003e without entering the RV.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-end=\"3232\" data-start=\"3072\"\u003eThis design trade-off makes the DFMDH25121 one of the \u003cstrong data-end=\"3162\" data-start=\"3126\"\u003emost adaptable furnace solutions\u003c\/strong\u003e for non-traditional RV builds and limited exterior wall applications.\u003c\/p\u003e\n\u003chr data-end=\"3237\" data-start=\"3234\"\u003e\n\u003ch2 data-end=\"3264\" data-start=\"3239\"\u003eWhy Choose This Model?\u003c\/h2\u003e\n\u003cp data-end=\"3401\" data-start=\"3266\"\u003eThe DFMDH25121 combines traditional propane furnace power with modern electronics and installation flexibility. Key advantages include:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli data-end=\"3448\" data-start=\"3405\"\u003eHall Effect sensing for reliable ignition\u003c\/li\u003e\n\u003cli data-end=\"3504\" data-start=\"3451\"\u003eSoft Start technology for reduced electrical demand\u003c\/li\u003e\n\u003cli data-end=\"3550\" data-start=\"3507\"\u003eCompact footprint for tight installations\u003c\/li\u003e\n\u003cli data-end=\"3590\" data-start=\"3553\"\u003eNo need for an exterior access door\u003c\/li\u003e\n\u003cli data-end=\"3646\" data-start=\"3593\"\u003eIdeal for custom RV, overland, or conversion projects\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-end=\"3651\" data-start=\"3648\"\u003e\n\u003ch2 data-end=\"3688\" data-start=\"3653\"\u003eFrequently Asked Questions (FAQ)\u003c\/h2\u003e\n\u003cp data-end=\"3880\" data-start=\"3690\"\u003e\u003cstrong data-end=\"3733\" data-start=\"3690\"\u003eQ: What does “Hall Effect sensor” mean?\u003c\/strong\u003e\u003cbr data-end=\"3736\" data-start=\"3733\"\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 data-end=\"4067\" data-start=\"3882\"\u003e\u003cstrong data-end=\"3918\" data-start=\"3882\"\u003eQ: Why is this model “doorless”?\u003c\/strong\u003e\u003cbr data-end=\"3921\" data-start=\"3918\"\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 data-end=\"4197\" data-start=\"4069\"\u003e\u003cstrong data-end=\"4107\" data-start=\"4069\"\u003eQ: Where do I service the furnace?\u003c\/strong\u003e\u003cbr data-end=\"4110\" data-start=\"4107\"\u003eA: From inside the RV; panels or trim must be removed to access the heater for service.\u003c\/p\u003e\n\u003cp data-end=\"4312\" data-start=\"4199\"\u003e\u003cstrong data-end=\"4237\" data-start=\"4199\"\u003eQ: Does this include a thermostat?\u003c\/strong\u003e\u003cbr data-end=\"4240\" data-start=\"4237\"\u003eA: No. A compatible 12V furnace thermostat must be purchased separately.\u003c\/p\u003e\n\u003cp data-end=\"4479\" data-start=\"4314\"\u003e\u003cstrong data-end=\"4362\" data-start=\"4314\"\u003eQ: Will this fit a standard furnace cut-out?\u003c\/strong\u003e\u003cbr data-end=\"4365\" data-start=\"4362\"\u003eA: It uses the same footprint as other 25,000 BTU DFM models, but always \u003cstrong data-end=\"4462\" data-start=\"4438\"\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:\/\/rvfurnaceguys.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"}