{"id":16636,"date":"2026-09-18T09:32:41","date_gmt":"2026-09-18T07:32:41","guid":{"rendered":"https:\/\/www.bitcoinstuffstore.com\/?post_type=product&#038;p=16636"},"modified":"2026-10-09T08:42:17","modified_gmt":"2026-10-09T06:42:17","slug":"ofen-3-base-xl","status":"publish","type":"product","link":"https:\/\/www.bitcoinstuffstore.com\/en_us\/product\/ofen-3-base-xl\/","title":{"rendered":"21energy Ofen 3 Base XL"},"content":{"rendered":"<div class=\"bss-product-content\">\n<ul class=\"bss-spec-list\">\n<li><strong>Heat output<\/strong>: 2.0 kW<\/li>\n<li><strong>Suitable for rooms up to<\/strong>: 100 m\u00b2<\/li>\n<li><strong>Hashrate<\/strong>: 80 TH\/s<\/li>\n<li><strong>Efficiency<\/strong>: 20 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 Base XL: heat your room and mine bitcoin at the same time<\/h2>\n<p>The 21energy Ofen 3 Base XL is built for spaces where 1 kW isn't enough: a workshop, a garage where you tinker, a studio, a practice room or a large open-plan kitchen. With 2 kW it heats up to 100 m\u00b2, and the 80 TH\/s of mining chips that produce that heat work on the Bitcoin network in the meantime. The XL housing is wider and lower than the slim Base and runs at 40 dB, audible like a quiet fan. In a workspace, that's no problem.<\/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 (2.0 kW \u00d7 \u20ac0.30)<\/td>\n<td>\u20ac0,60<\/td>\n<\/tr>\n<tr>\n<td>Mined (80 TH\/s)<\/td>\n<td>about \u20ac0.11<\/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 2.0 kW electric heater<\/td>\n<td>\u20ac0,60<\/td>\n<\/tr>\n<tr>\n<td>2.0 kW of heat from gas<\/td>\n<td>about \u20ac0.30<\/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>Base XL or Pro XL?<\/h2>\n<p>Same housing, same noise, almost the same heat. The Base XL has 80 TH\/s at 20 J\/TH, the <a href=\"https:\/\/www.bitcoinstuffstore.com\/en_us\/product\/ofen-3-pro-xl\/\">Ofen 3 Pro XL<\/a> 120 TH\/s at 17.5 J\/TH and 2.2 kW. The Pro XL costs about 1,100 euros more and gets a third more hashrate per kilowatt-hour. If the heater runs for hours every day in a commercial space, the Pro XL is the better choice. For a garage where you tinker on weekends, the Base XL is more than enough.<\/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><strong>Ofen 3 Base XL<\/strong><\/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><a href=\"https:\/\/www.bitcoinstuffstore.com\/en_us\/product\/ofen-3-pro-xl\/\">Ofen 3 Pro XL<\/a><\/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 Base 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 Base XL use?<\/div>\n<div class=\"bss-faq-answer\">About 2.0 kW at full power, the same as a regular 2.0 kW electric heater. At \u20ac0.30 per kWh that's \u20ac0.60 per hour. Subtract what the miner earns: about \u20ac0.11 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 Base 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 Base XL draws 2.0 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>2 kW bitcoin heater for a workshop, garage or large open space.<\/strong><\/p>\n<ul>\n<li><strong>Heats<\/strong>: up to 100 m\u00b2 with 2.0 kW<\/li>\n<li><strong>Mines<\/strong>: 80 TH\/s at 20 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":16634,"comment_status":"open","ping_status":"closed","template":"","meta":{"rank_math_focus_keyword":"Ofen 3 Base XL","rank_math_title":"21energy Ofen 3 Base XL kopen | Sterke bitcoin kachel, 2 kW","rank_math_description":"De Ofen 3 Base XL verwarmt tot 100 m\u00b2 met 2 kW en mined bitcoin met 80 TH\/s. Voor werkplaats, garage, atelier of grote open ruimte. 40 dB, wifi, app.","rank_math_canonical_url":"","rank_math_facebook_title":"","rank_math_facebook_description":"","rank_math_facebook_image":"","rank_math_twitter_title":"","rank_math_twitter_description":"","rank_math_twitter_image":"","rank_math_pillar_content":"","rank_math_breadcrumb_title":"","site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"_joinchat":[]},"product_brand":[497],"product_cat":[489,164],"product_tag":[490,494,495,491],"class_list":["post-16636","product","type-product","status-publish","has-post-thumbnail","product_brand-21energy","product_cat-bitcoin-verwarming","product_cat-solo-miners","product_tag-21energy","product_tag-bitcoin-kachel","product_tag-bitcoin-verwarming","product_tag-ofen-3","desktop-align-center","tablet-align-left","mobile-align-left","ast-product-gallery-layout-horizontal-slider","ast-product-single-variable","ast-product-tabs-layout-horizontal","first","instock","taxable","shipping-taxable","purchasable","product-type-variable","has-default-attributes"],"_links":{"self":[{"href":"https:\/\/www.bitcoinstuffstore.com\/en_us\/wp-json\/wp\/v2\/product\/16636","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.bitcoinstuffstore.com\/en_us\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/www.bitcoinstuffstore.com\/en_us\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/www.bitcoinstuffstore.com\/en_us\/wp-json\/wp\/v2\/comments?post=16636"}],"version-history":[{"count":4,"href":"https:\/\/www.bitcoinstuffstore.com\/en_us\/wp-json\/wp\/v2\/product\/16636\/revisions"}],"predecessor-version":[{"id":16680,"href":"https:\/\/www.bitcoinstuffstore.com\/en_us\/wp-json\/wp\/v2\/product\/16636\/revisions\/16680"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.bitcoinstuffstore.com\/en_us\/wp-json\/wp\/v2\/media\/16634"}],"wp:attachment":[{"href":"https:\/\/www.bitcoinstuffstore.com\/en_us\/wp-json\/wp\/v2\/media?parent=16636"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/www.bitcoinstuffstore.com\/en_us\/wp-json\/wp\/v2\/product_brand?post=16636"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/www.bitcoinstuffstore.com\/en_us\/wp-json\/wp\/v2\/product_cat?post=16636"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/www.bitcoinstuffstore.com\/en_us\/wp-json\/wp\/v2\/product_tag?post=16636"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}