{"product_id":"dometic™-dfmdh35121-rv-furnace-35-000-btu-lp-gas-bottom-discharge-12v-dc","title":"Dometic™ DFMDH35121 RV Furnace – 35,000 BTU – LP Gas – Bottom Discharge – 12V DC","description":"\u003ch1 data-start=\"254\" data-end=\"338\"\u003eDometic™ DFMDH35121 RV Furnace – 35,000 BTU – LP Gas – Bottom Discharge – 12V DC\u003c\/h1\u003e\n\u003cp data-start=\"339\" data-end=\"409\"\u003e\u003cstrong data-start=\"339\" data-end=\"409\"\u003eDFM Series | Hall Effect Sensor | Doorless Model | 2-Year Warranty\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-start=\"411\" data-end=\"739\"\u003e\u003cstrong data-start=\"411\" data-end=\"421\"\u003eModel:\u003c\/strong\u003e DFMDH35121\u003cbr data-start=\"432\" data-end=\"435\"\u003e\u003cstrong data-start=\"435\" data-end=\"446\"\u003eSeries:\u003c\/strong\u003e DFM “H” Series\u003cbr data-start=\"461\" data-end=\"464\"\u003e\u003cstrong data-start=\"464\" data-end=\"478\"\u003eFuel Type:\u003c\/strong\u003e LP Gas (Propane)\u003cbr data-start=\"495\" data-end=\"498\"\u003e\u003cstrong data-start=\"498\" data-end=\"513\"\u003eBTU Output:\u003c\/strong\u003e 35,000 BTU\u003cbr data-start=\"524\" data-end=\"527\"\u003e\u003cstrong data-start=\"527\" data-end=\"537\"\u003eStage:\u003c\/strong\u003e Single Stage\u003cbr data-start=\"550\" data-end=\"553\"\u003e\u003cstrong data-start=\"553\" data-end=\"565\"\u003eVoltage:\u003c\/strong\u003e 12 Volt DC\u003cbr data-start=\"576\" data-end=\"579\"\u003e\u003cstrong data-start=\"579\" data-end=\"598\"\u003eDischarge Type:\u003c\/strong\u003e Bottom Discharge\u003cbr data-start=\"615\" data-end=\"618\"\u003e\u003cstrong data-start=\"618\" data-end=\"637\"\u003eGas Connection:\u003c\/strong\u003e Rear Gas Manifold\u003cbr data-start=\"655\" data-end=\"658\"\u003e\u003cstrong data-start=\"658\" data-end=\"676\"\u003eExterior Door:\u003c\/strong\u003e Not Required (Doorless Model)\u003cbr data-start=\"706\" data-end=\"709\"\u003e\u003cstrong data-start=\"709\" data-end=\"739\"\u003eThermostat Sold Separately\u003c\/strong\u003e\u003c\/p\u003e\n\u003chr data-start=\"741\" data-end=\"744\"\u003e\n\u003ch2 data-start=\"746\" data-end=\"765\"\u003eProduct Overview\u003c\/h2\u003e\n\u003cp data-start=\"767\" data-end=\"959\"\u003eThe \u003cstrong data-start=\"771\" data-end=\"794\"\u003eDometic™ DFMDH35121\u003c\/strong\u003e is a high-output \u003cstrong data-start=\"812\" data-end=\"844\"\u003e35,000 BTU LP gas RV furnace\u003c\/strong\u003e designed for medium-sized heating applications where maximum flexibility and installation simplicity are required.\u003c\/p\u003e\n\u003cp data-start=\"961\" data-end=\"1312\"\u003eThis model is part of the advanced \u003cstrong data-start=\"996\" data-end=\"1014\"\u003eDFM “H” Series\u003c\/strong\u003e, featuring a modern \u003cstrong data-start=\"1035\" data-end=\"1078\"\u003eHall Effect airflow verification system\u003c\/strong\u003e that replaces the traditional mechanical sail switch. The Hall sensor electronically monitors blower motor rotation to confirm proper airflow before ignition — improving reliability and reducing common airflow-related service issues.\u003c\/p\u003e\n\u003cp data-start=\"1314\" data-end=\"1528\"\u003eUnlike standard furnace models, the DFMDH35121 is a \u003cstrong data-start=\"1366\" data-end=\"1392\"\u003edoorless configuration\u003c\/strong\u003e, meaning no exterior access door is required for installation. This eliminates the need to cut a large hole in the sidewall of your RV.\u003c\/p\u003e\n\u003cp data-start=\"1530\" data-end=\"1598\"\u003eThis makes the DFMDH35121 one of the easiest furnaces to install in:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli data-start=\"1602\" data-end=\"1619\"\u003eVan conversions\u003c\/li\u003e\n\u003cli data-start=\"1622\" data-end=\"1645\"\u003eSmall travel trailers\u003c\/li\u003e\n\u003cli data-start=\"1648\" data-end=\"1663\"\u003eTruck campers\u003c\/li\u003e\n\u003cli data-start=\"1666\" data-end=\"1683\"\u003eOverland builds\u003c\/li\u003e\n\u003cli data-start=\"1686\" data-end=\"1698\"\u003eTiny homes\u003c\/li\u003e\n\u003cli data-start=\"1701\" data-end=\"1721\"\u003eIce fishing houses\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"1723\" data-end=\"1818\"\u003e⚠ \u003cstrong data-start=\"1725\" data-end=\"1739\"\u003eImportant:\u003c\/strong\u003e Always measure your existing cut-out before ordering to ensure proper fitment.\u003c\/p\u003e\n\u003chr data-start=\"1820\" data-end=\"1823\"\u003e\n\u003ch1 data-start=\"1825\" data-end=\"1839\"\u003eKey Features\u003c\/h1\u003e\n\u003cul\u003e\n\u003cli data-start=\"1843\" data-end=\"1872\"\u003e35,000 BTU heating capacity\u003c\/li\u003e\n\u003cli data-start=\"1875\" data-end=\"1903\"\u003eLP gas (propane) operation\u003c\/li\u003e\n\u003cli data-start=\"1906\" data-end=\"1940\"\u003eSingle-stage heating performance\u003c\/li\u003e\n\u003cli data-start=\"1943\" data-end=\"1983\"\u003eBottom discharge airflow configuration\u003c\/li\u003e\n\u003cli data-start=\"1986\" data-end=\"2008\"\u003e12 Volt DC operation\u003c\/li\u003e\n\u003cli data-start=\"2011\" data-end=\"2077\"\u003e\u003cstrong data-start=\"2011\" data-end=\"2075\"\u003eHall Effect airflow verification (no mechanical sail switch)\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli data-start=\"2080\" data-end=\"2112\"\u003eBuilt-In Soft Start technology\u003c\/li\u003e\n\u003cli data-start=\"2115\" data-end=\"2148\"\u003eRear gas manifold configuration\u003c\/li\u003e\n\u003cli data-start=\"2151\" data-end=\"2203\"\u003eDoorless design (no exterior access door required)\u003c\/li\u003e\n\u003cli data-start=\"2206\" data-end=\"2241\"\u003eFlexible installation orientation\u003c\/li\u003e\n\u003cli data-start=\"2244\" data-end=\"2272\"\u003eThermostat sold separately\u003c\/li\u003e\n\u003cli data-start=\"2275\" data-end=\"2315\"\u003e\u003cstrong data-start=\"2275\" data-end=\"2315\"\u003e2-Year Limited Manufacturer Warranty\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"2317\" data-end=\"2320\"\u003e\n\u003ch1 data-start=\"2322\" data-end=\"2338\"\u003eSpecifications\u003c\/h1\u003e\n\u003cul\u003e\n\u003cli data-start=\"2342\" data-end=\"2365\"\u003e\n\u003cstrong data-start=\"2342\" data-end=\"2352\"\u003eModel:\u003c\/strong\u003e DFMDH35121\u003c\/li\u003e\n\u003cli data-start=\"2368\" data-end=\"2394\"\u003e\n\u003cstrong data-start=\"2368\" data-end=\"2379\"\u003eSeries:\u003c\/strong\u003e DFM H Series\u003c\/li\u003e\n\u003cli data-start=\"2397\" data-end=\"2425\"\u003e\n\u003cstrong data-start=\"2397\" data-end=\"2412\"\u003eBTU Rating:\u003c\/strong\u003e 35,000 BTU\u003c\/li\u003e\n\u003cli data-start=\"2428\" data-end=\"2451\"\u003e\n\u003cstrong data-start=\"2428\" data-end=\"2442\"\u003eFuel Type:\u003c\/strong\u003e LP Gas\u003c\/li\u003e\n\u003cli data-start=\"2454\" data-end=\"2487\"\u003e\n\u003cstrong data-start=\"2454\" data-end=\"2472\"\u003eHeating Stage:\u003c\/strong\u003e Single Stage\u003c\/li\u003e\n\u003cli data-start=\"2490\" data-end=\"2515\"\u003e\n\u003cstrong data-start=\"2490\" data-end=\"2502\"\u003eVoltage:\u003c\/strong\u003e 12 Volt DC\u003c\/li\u003e\n\u003cli data-start=\"2518\" data-end=\"2563\"\u003e\n\u003cstrong data-start=\"2518\" data-end=\"2544\"\u003eAirflow Configuration:\u003c\/strong\u003e Bottom Discharge\u003c\/li\u003e\n\u003cli data-start=\"2566\" data-end=\"2601\"\u003e\n\u003cstrong data-start=\"2566\" data-end=\"2585\"\u003eGas Connection:\u003c\/strong\u003e Rear Manifold\u003c\/li\u003e\n\u003cli data-start=\"2604\" data-end=\"2630\"\u003e\n\u003cstrong data-start=\"2604\" data-end=\"2614\"\u003eWidth:\u003c\/strong\u003e 16-1\/2 inches\u003c\/li\u003e\n\u003cli data-start=\"2633\" data-end=\"2655\"\u003e\n\u003cstrong data-start=\"2633\" data-end=\"2644\"\u003eHeight:\u003c\/strong\u003e 7 inches\u003c\/li\u003e\n\u003cli data-start=\"2658\" data-end=\"2680\"\u003e\n\u003cstrong data-start=\"2658\" data-end=\"2668\"\u003eDepth:\u003c\/strong\u003e 20 inches\u003c\/li\u003e\n\u003cli data-start=\"2683\" data-end=\"2727\"\u003e\n\u003cstrong data-start=\"2683\" data-end=\"2706\"\u003eAirflow Monitoring:\u003c\/strong\u003e Hall Effect Sensor\u003c\/li\u003e\n\u003cli data-start=\"2730\" data-end=\"2751\"\u003e\n\u003cstrong data-start=\"2730\" data-end=\"2745\"\u003eSoft Start:\u003c\/strong\u003e Yes\u003c\/li\u003e\n\u003cli data-start=\"2754\" data-end=\"2803\"\u003e\n\u003cstrong data-start=\"2754\" data-end=\"2781\"\u003eExterior Door Included:\u003c\/strong\u003e No (Doorless Model)\u003c\/li\u003e\n\u003cli data-start=\"2806\" data-end=\"2835\"\u003e\n\u003cstrong data-start=\"2806\" data-end=\"2830\"\u003eThermostat Included:\u003c\/strong\u003e No\u003c\/li\u003e\n\u003cli data-start=\"2838\" data-end=\"2890\"\u003e\n\u003cstrong data-start=\"2838\" data-end=\"2851\"\u003eWarranty:\u003c\/strong\u003e 2-Year Limited Manufacturer Warranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"2892\" data-end=\"2895\"\u003e\n\u003ch1 data-start=\"2897\" data-end=\"2934\"\u003eDoorless Installation – Pros \u0026amp; Cons\u003c\/h1\u003e\n\u003ch3 data-start=\"2936\" data-end=\"2950\"\u003eBenefits\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli data-start=\"2953\" data-end=\"2990\"\u003eNo large exterior wall cut required\u003c\/li\u003e\n\u003cli data-start=\"2993\" data-end=\"3025\"\u003eCleaner RV exterior appearance\u003c\/li\u003e\n\u003cli data-start=\"3028\" data-end=\"3069\"\u003eGreater flexibility in mounting options\u003c\/li\u003e\n\u003cli data-start=\"3072\" data-end=\"3111\"\u003eEasier installation for custom builds\u003c\/li\u003e\n\u003cli data-start=\"3114\" data-end=\"3157\"\u003eIdeal for compact or specialty RV layouts\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-start=\"3159\" data-end=\"3179\"\u003e⚠ Considerations\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli data-start=\"3182\" data-end=\"3227\"\u003eFurnace must be serviced from inside the RV\u003c\/li\u003e\n\u003cli data-start=\"3230\" data-end=\"3272\"\u003eNo exterior access panel for maintenance\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"3274\" data-end=\"3370\"\u003eFor many van and custom builds, avoiding a large exterior cut is a major installation advantage.\u003c\/p\u003e\n\u003chr data-start=\"3372\" data-end=\"3375\"\u003e\n\u003ch1 data-start=\"3377\" data-end=\"3409\"\u003eWhy Choose the DFM “H” Series?\u003c\/h1\u003e\n\u003cp data-start=\"3411\" data-end=\"3473\"\u003eTraditional RV furnaces use mechanical sail switches that can:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli data-start=\"3477\" data-end=\"3502\"\u003eStick or collect debris\u003c\/li\u003e\n\u003cli data-start=\"3505\" data-end=\"3543\"\u003eCause intermittent ignition failures\u003c\/li\u003e\n\u003cli data-start=\"3546\" data-end=\"3579\"\u003eRequire cleaning or replacement\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"3581\" data-end=\"3701\"\u003eThe \u003cstrong data-start=\"3585\" data-end=\"3607\"\u003eHall Effect system\u003c\/strong\u003e in the DFMDH35121 electronically verifies airflow by monitoring motor rotation, resulting in:\u003c\/p\u003e\n\u003cp data-start=\"3703\" data-end=\"3829\"\u003e✔ Improved ignition reliability\u003cbr data-start=\"3734\" data-end=\"3737\"\u003e✔ Reduced maintenance\u003cbr data-start=\"3758\" data-end=\"3761\"\u003e✔ Better cold-weather performance\u003cbr data-start=\"3794\" data-end=\"3797\"\u003e✔ Fewer airflow-related faults\u003c\/p\u003e\n\u003cp data-start=\"3831\" data-end=\"3938\"\u003eCombined with Soft Start technology, it reduces startup surge and protects your RV’s 12V electrical system.\u003c\/p\u003e\n\u003chr data-start=\"3940\" data-end=\"3943\"\u003e\n\u003ch1 data-start=\"3945\" data-end=\"3979\"\u003eFrequently Asked Questions (FAQ)\u003c\/h1\u003e\n\u003cp data-start=\"3981\" data-end=\"4118\"\u003e\u003cstrong data-start=\"3981\" data-end=\"4020\"\u003eQ: What does the “H” in DFMDH mean?\u003c\/strong\u003e\u003cbr data-start=\"4020\" data-end=\"4023\"\u003eA: It indicates a Hall Effect airflow verification system rather than a mechanical sail switch.\u003c\/p\u003e\n\u003cp data-start=\"4120\" data-end=\"4212\"\u003e\u003cstrong data-start=\"4120\" data-end=\"4177\"\u003eQ: Does this furnace require an exterior access door?\u003c\/strong\u003e\u003cbr data-start=\"4177\" data-end=\"4180\"\u003eA: No. This is a doorless model.\u003c\/p\u003e\n\u003cp data-start=\"4214\" data-end=\"4305\"\u003e\u003cstrong data-start=\"4214\" data-end=\"4257\"\u003eQ: Where is the gas connection located?\u003c\/strong\u003e\u003cbr data-start=\"4257\" data-end=\"4260\"\u003eA: It uses a rear gas manifold configuration.\u003c\/p\u003e\n\u003cp data-start=\"4307\" data-end=\"4378\"\u003e\u003cstrong data-start=\"4307\" data-end=\"4335\"\u003eQ: Is this propane only?\u003c\/strong\u003e\u003cbr data-start=\"4335\" data-end=\"4338\"\u003eA: Yes, it operates on LP gas (propane).\u003c\/p\u003e\n\u003cp data-start=\"4380\" data-end=\"4487\"\u003e\u003cstrong data-start=\"4380\" data-end=\"4412\"\u003eQ: Is a thermostat included?\u003c\/strong\u003e\u003cbr data-start=\"4412\" data-end=\"4415\"\u003eA: No. A compatible 12V furnace thermostat must be purchased separately.\u003c\/p\u003e\n\u003cp data-start=\"4489\" data-end=\"4589\"\u003e\u003cstrong data-start=\"4489\" data-end=\"4522\"\u003eQ: What warranty is included?\u003c\/strong\u003e\u003cbr data-start=\"4522\" data-end=\"4525\"\u003eA: This furnace includes a 2-year limited manufacturer warranty.\u003c\/p\u003e","brand":"RV Furnace Guys","offers":[{"title":"Default Title","offer_id":47857606623473,"sku":null,"price":1499.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0784\/4941\/0289\/files\/351211.png?v=1772400431","url":"https:\/\/rvfurnaceguys.com\/products\/dometic%e2%84%a2-dfmdh35121-rv-furnace-35-000-btu-lp-gas-bottom-discharge-12v-dc","provider":"RV Furnace Guys","version":"1.0","type":"link"}