{"id":16615,"date":"2026-09-18T09:28:32","date_gmt":"2026-09-18T07:28:32","guid":{"rendered":"https:\/\/www.bitcoinstuffstore.com\/?post_type=product&#038;p=16615"},"modified":"2026-10-09T08:42:23","modified_gmt":"2026-10-09T06:42:23","slug":"ofen-3-pro-xl","status":"publish","type":"product","link":"https:\/\/www.bitcoinstuffstore.com\/en_us\/product\/ofen-3-pro-xl\/","title":{"rendered":"21energy Ofen 3 Pro XL"},"content":{"rendered":"<div class=\"bss-product-content\">\n<ul class=\"bss-spec-list\">\n<li><strong>Heat output<\/strong>: 2.2 kW<\/li>\n<li><strong>Suitable for rooms up to<\/strong>: 110 m\u00b2<\/li>\n<li><strong>Hashrate<\/strong>: 120 TH\/s<\/li>\n<li><strong>Efficiency<\/strong>: 17.5 J\/TH<\/li>\n<li><strong>Noise level<\/strong>: about 40 dB<\/li>\n<li><strong>Dimensions (w \u00d7 h \u00d7 d)<\/strong>: 63 \u00d7 83 \u00d7 16 cm<\/li>\n<li><strong>Weight<\/strong>: about 28 kg<\/li>\n<li><strong>Power connection<\/strong>: regular wall outlet, 230 V<\/li>\n<li><strong>Network<\/strong>: Wi-Fi<\/li>\n<li><strong>Controls<\/strong>: 21energy app (iOS, Android), Home Assistant, open API<\/li>\n<li><strong>Thermostat<\/strong>: yes, via the included RuuviTag<\/li>\n<li><strong>Colors<\/strong>: white, black<\/li>\n<li><strong>Warranty<\/strong>: 12-month manufacturer's warranty plus statutory rights<\/li>\n<li><strong>Delivery time<\/strong>: 3 to 5 business days<\/li>\n<li><strong>Made in<\/strong>: Austria<\/li>\n<\/ul>\n<h2>Buy the 21energy Ofen 3 Pro XL: heat your room and mine bitcoin at the same time<\/h2>\n<p>The 21energy Ofen 3 Pro XL is the flagship of the series: 2.2 kW for spaces up to 110 m\u00b2 and 120 TH\/s at 17.5 J\/TH. That's the hashrate of three Base heaters in one device, and the most sats per kilowatt-hour in the whole series. It's made for places where the heater runs long and often anyway: a workshop, a large open living space, a showroom, a home office or a small commercial hall. Same XL housing as the Base XL, 40 dB, in white or black.<\/p>\n<h2>How the Ofen 3 works<\/h2>\n<p>A bitcoin miner turns almost all the electricity it uses into heat; that's physics, not a side effect. 21energy builds a heater around it: chips in a closed housing with a quiet fan, warm air out the top, and in the meantime the miner works on the Bitcoin network. You set it up in three minutes with the 21energy app: connect to Wi-Fi, enter your pool details, done. Schedules, a thermostat via the included RuuviTag, Home Assistant and an open API are all built in. The mined bitcoin arrives in your pool account and you send it on to your own wallet.<\/p>\n<h2>Honest about the costs<\/h2>\n<p>At the average Dutch electricity rate, electric heating costs more than gas or a heat pump, even with a miner inside. The Ofen 3 is, however, the cheapest way to heat electrically, because every other electric heater gives nothing back. It fits three situations: solar panels with a dynamic contract, a room without central heating (garage, workshop, studio, tiny house), or you're a bitcoiner and you simply want one. Heating a regular home with gas and mainly looking to save money? Then this isn't your product, and we'd rather tell you now than after delivery.<\/p>\n<table>\n<thead>\n<tr>\n<th><\/th>\n<th>Per hour at full power<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Electricity (2.2 kW \u00d7 \u20ac0.30)<\/td>\n<td>\u20ac0,66<\/td>\n<\/tr>\n<tr>\n<td>Mined (120 TH\/s)<\/td>\n<td>about \u20ac0.17<\/td>\n<\/tr>\n<tr>\n<td><strong>Net electricity cost<\/strong><\/td>\n<td><strong>about \u20ac0.49<\/strong><\/td>\n<\/tr>\n<tr>\n<td>Regular 2.2 kW electric heater<\/td>\n<td>\u20ac0,66<\/td>\n<\/tr>\n<tr>\n<td>2.2 kW of heat from gas<\/td>\n<td>about \u20ac0.33<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Reference date late August 2026: electricity \u20ac0.30 per kWh, hashprice 38 USD per PH\/s per day, 1 USD = 0.90 EUR, gas \u20ac0.15 per kWh of heat. The hashprice moves daily with the price and the network, so what you mine is never a fixed amount. What is certain: the Ofen uses exactly as much as a regular heater of the same power, and everything the miner earns comes off that. The full calculation is on the category page <a href=\"https:\/\/www.bitcoinstuffstore.com\/en_us\/productcategory\/bitcoin-heating\/\">bitcoin heating<\/a>.<\/p>\n<h2>Who the Pro XL is the right choice for<\/h2>\n<p>Buy the Pro XL if two conditions are met: your space really needs 2 kW or more, and the heater will run for many hours. If only the first is true, the <a href=\"https:\/\/www.bitcoinstuffstore.com\/en_us\/product\/ofen-3-base-xl\/\">Base XL<\/a> is 1,100 euros cheaper and heats almost the same. If only the second is true, the <a href=\"https:\/\/www.bitcoinstuffstore.com\/en_us\/product\/ofen-3-pro\/\">Ofen 3 Pro<\/a> in the slim housing is probably a better fit. Two Ofen 3 Pros spread over two rooms are often more practical than one Pro XL in a hallway.<\/p>\n<h2>All four models side by side<\/h2>\n<table>\n<thead>\n<tr>\n<th>Model<\/th>\n<th>Heating<\/th>\n<th>Space<\/th>\n<th>Hashrate<\/th>\n<th>Efficiency<\/th>\n<th>Noise<\/th>\n<th>Price<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><a href=\"https:\/\/www.bitcoinstuffstore.com\/en_us\/product\/ofen-3-base\/\">Ofen 3 Base<\/a><\/td>\n<td>1.0 kW<\/td>\n<td>up to 50 m\u00b2<\/td>\n<td>40 TH\/s<\/td>\n<td>20 J\/TH<\/td>\n<td>35 dB<\/td>\n<td>\u20ac1999,00<\/td>\n<\/tr>\n<tr>\n<td><a href=\"https:\/\/www.bitcoinstuffstore.com\/en_us\/product\/ofen-3-pro\/\">Ofen 3 Pro<\/a><\/td>\n<td>1.1 kW<\/td>\n<td>up to 55 m\u00b2<\/td>\n<td>60 TH\/s<\/td>\n<td>17.5 J\/TH<\/td>\n<td>35 dB<\/td>\n<td>\u20ac2799,00<\/td>\n<\/tr>\n<tr>\n<td><a href=\"https:\/\/www.bitcoinstuffstore.com\/en_us\/product\/ofen-3-base-xl\/\">Ofen 3 Base XL<\/a><\/td>\n<td>2.0 kW<\/td>\n<td>up to 100 m\u00b2<\/td>\n<td>80 TH\/s<\/td>\n<td>20 J\/TH<\/td>\n<td>40 dB<\/td>\n<td>\u20ac2899,00<\/td>\n<\/tr>\n<tr>\n<td><strong>Ofen 3 Pro XL<\/strong><\/td>\n<td>2.2 kW<\/td>\n<td>up to 110 m\u00b2<\/td>\n<td>120 TH\/s<\/td>\n<td>17.5 J\/TH<\/td>\n<td>40 dB<\/td>\n<td>\u20ac3999,00<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>What's in the box<\/h2>\n<ul>\n<li>The Ofen 3 itself, in white or black<\/li>\n<li>Basic stand to set it up freestanding<\/li>\n<li>RuuviTag temperature sensor for the thermostat function<\/li>\n<li>Power cable for a regular wall outlet<\/li>\n<li>Quick start guide<\/li>\n<\/ul>\n<p>A <a href=\"https:\/\/www.bitcoinstuffstore.com\/en_us\/product\/21energy-wandhouder-ofen-3\/\">wall mount<\/a> or the <a href=\"https:\/\/www.bitcoinstuffstore.com\/en_us\/product\/21energy-premium-voet-ofen-3\/\">premium stand<\/a> is sold separately.<\/p>\n<h2>Frequently asked questions about the Ofen 3 Pro XL<\/h2>\n<div class=\"bss-faq\">\n<div class=\"bss-faq-item is-open\">\n<div class=\"bss-faq-question\">Which Ofen 3 fits my space?<\/div>\n<div class=\"bss-faq-answer\">Base and Pro (about 1 kW, up to 50 to 55 m\u00b2, 35 dB) for a living room, bedroom or office. Base XL and Pro XL (about 2 kW, up to 100 to 110 m\u00b2, 40 dB) for a workshop, garage, studio or large open space. Pro means 50% more hashrate for the same heat.<\/div>\n<\/div>\n<div class=\"bss-faq-item\">\n<div class=\"bss-faq-question\">How much power does the Ofen 3 Pro XL use?<\/div>\n<div class=\"bss-faq-answer\">About 2.2 kW at full power, the same as a regular 2.2 kW electric heater. At \u20ac0.30 per kWh that's \u20ac0.66 per hour. Subtract what the miner earns: about \u20ac0.17 per hour in the example calculation on this page.<\/div>\n<\/div>\n<div class=\"bss-faq-item\">\n<div class=\"bss-faq-question\">How much noise does the Ofen 3 Pro XL make?<\/div>\n<div class=\"bss-faq-answer\">About 40 dB. Audible like a quiet fan, and fine for a workshop, garage or large open space.<\/div>\n<\/div>\n<div class=\"bss-faq-item\">\n<div class=\"bss-faq-question\">Can I plug the Ofen 3 into a regular wall outlet?<\/div>\n<div class=\"bss-faq-answer\">Yes. The Ofen 3 Pro XL draws 2.2 kW and fits on a standard 16 A circuit. Don't put a second heavy appliance on the same circuit, such as a dryer or a kettle.<\/div>\n<\/div>\n<div class=\"bss-faq-item\">\n<div class=\"bss-faq-question\">Do I need to know about mining?<\/div>\n<div class=\"bss-faq-answer\">No. The 21energy app walks you through the setup in about three minutes. All you need is Wi-Fi and a mining pool account. If you get stuck, we'll help you via WhatsApp.<\/div>\n<\/div>\n<div class=\"bss-faq-item\">\n<div class=\"bss-faq-question\">Can I run the Ofen 3 on a schedule?<\/div>\n<div class=\"bss-faq-answer\">Yes. In the app you set on and off times with a heat level per time slot, and with the included RuuviTag sensor it works as a thermostat on room temperature. Switching it off when you don't need heat is always possible and does the device no harm.<\/div>\n<\/div>\n<div class=\"bss-faq-item\">\n<div class=\"bss-faq-question\">Does the Ofen 3 work with Home Assistant?<\/div>\n<div class=\"bss-faq-answer\">Yes, there's an official Home Assistant integration. You connect other smart home systems through the open API on the device.<\/div>\n<\/div>\n<div class=\"bss-faq-item\">\n<div class=\"bss-faq-question\">Do I need a fast internet connection?<\/div>\n<div class=\"bss-faq-answer\">No, the Ofen 3 uses less than 1 Mbit\/s. What does matter is a stable connection, because the miner stays connected to the pool as long as it's on.<\/div>\n<\/div>\n<div class=\"bss-faq-item\">\n<div class=\"bss-faq-question\">How do I receive the bitcoin the Ofen mines?<\/div>\n<div class=\"bss-faq-answer\">The pool credits your share to your pool account. From there you send it to your own wallet, preferably a <a href=\"https:\/\/www.bitcoinstuffstore.com\/en_us\/productcategory\/hardware-wallets\/\">hardware wallet<\/a> so you hold the keys yourself.<\/div>\n<\/div>\n<div class=\"bss-faq-item\">\n<div class=\"bss-faq-question\">What's the warranty and how long does delivery take?<\/div>\n<div class=\"bss-faq-answer\">12-month manufacturer's warranty from 21energy, on top of your statutory consumer rights with us. Overclocking voids the warranty. The Ofen is shipped by our partner, with a delivery time of 3 to 5 business days.<\/div>\n<\/div>\n<\/div>\n<\/div>","protected":false},"excerpt":{"rendered":"<p><strong>The flagship: 2.2 kW of heat and 120 TH\/s, the hashrate of three Base heaters.<\/strong><\/p>\n<ul>\n<li><strong>Heats<\/strong>: up to 110 m\u00b2 with 2.2 kW<\/li>\n<li><strong>Mines<\/strong>: 120 TH\/s at 17.5 J\/TH<\/li>\n<li><strong>Noise<\/strong>: 40 dB, like a quiet fan<\/li>\n<li><strong>Controls<\/strong>: app, thermostat, Home Assistant<\/li>\n<li><strong>Delivery<\/strong>: 3 to 5 business days, 12-month warranty<\/li>\n<\/ul>","protected":false},"featured_media":16607,"comment_status":"open","ping_status":"closed","template":"","meta":{"rank_math_focus_keyword":"Ofen 3 Pro XL","rank_math_title":"21energy Ofen 3 Pro XL | Krachtige bitcoin kachel, 120 TH\/s","rank_math_description":"De Ofen 3 Pro XL verwarmt tot 110 m\u00b2 met 2,2 kW en mined bitcoin met 120 TH\/s bij 17,5 J\/TH. 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