{"product_id":"steam-oak-hiili-2m-black-thermowood-barrel-sauna","title":"Steam \u0026 Oak Hiili 2m Black Thermowood Barrel Sauna (Harvia 9kW, WiFi Option)","description":"\u003ch2\u003eSteam \u0026amp; Oak Hiili 2m Black Thermowood Barrel Sauna\u003c\/h2\u003e\n\n\u003cp\u003eA black barrel sauna, finished at the factory rather than painted in a yard afterwards. Almost every black barrel sold in this country is somebody's paint job on a natural barrel. This one comes out of the line in Coal Black, on thermally modified timber, with the option of black or mirrored glass to match.\u003c\/p\u003e\n\n\u003ch3\u003eThe 44mm walls, and why we keep going on about them\u003c\/h3\u003e\n\u003cp\u003eMost imported barrel saunas are built from 38mm or 40mm staves. We have priced up more than forty of them this year and that is where the bulk of the market sits. This one is 44mm.\u003c\/p\u003e\n\u003cp\u003eOn a barrel that matters more than it would on almost any other garden building, because the wall is the entire thermal envelope. There is no cavity, no insulation batt, no inner lining. The timber is the insulation, and it is also the heat store.\u003c\/p\u003e\n\u003cp\u003eSo the extra 6mm over a 38mm barrel does two jobs at once:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eIt insulates better.\u003c\/strong\u003e Thermal resistance rises directly with thickness, so on the standard figure for softwood a 44mm wall gives you roughly \u003cstrong\u003e16% more resistance than a 38mm wall\u003c\/strong\u003e and about 10% more than a 40mm one.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIt stores more heat.\u003c\/strong\u003e That same 16% is 16% more timber mass sitting around you. Once a solid timber sauna is up to temperature it holds and re-radiates rather than needing constant topping up, which is what you notice on the second and third session of an evening rather than the first.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThere is a third benefit that is harder to put a number on. Thicker staves are stiffer and cup less as they move through wet and dry seasons, so the joints between them stay tighter for longer. In a structure this small, air leaking through gaps costs you more heat than the wall itself does. That is the failure nobody photographs.\u003c\/p\u003e\n\n\u003ch3\u003eA solid back, and why we would leave it that way\u003c\/h3\u003e\n\u003cp\u003eThis barrel ships with a \u003cstrong\u003esolid rear wall\u003c\/strong\u003e as standard. No half moon window, no panoramic glass.\u003c\/p\u003e\n\u003cp\u003ePlenty of barrels are sold with a glazed back and they do look wonderful in a photograph. What the photograph does not show you is that a glass panel loses heat somewhere in the order of ten times faster than the insulated wall it replaced. Put a large one in the back of a small barrel and you have quietly undone a good part of what the 44mm walls were doing for you, and you will pay for it on the electricity bill every session for as long as you own it.\u003c\/p\u003e\n\u003cp\u003eThere is also the practical bit. A rear window looks out at whatever is behind the sauna, which in most gardens is a fence, and at night it is a black mirror. The view you actually want is through the door, on your way in and out.\u003c\/p\u003e\n\u003cp\u003eIf you do want glazing we can do it. Two rear windows, a half panoramic or a full panoramic are all available, as are black and mirrored glass. Just ask, and we will tell you honestly what it costs you in heat before you commit.\u003c\/p\u003e\n\n\u003ch3\u003eThermowood\u003c\/h3\u003e\n\u003cp\u003eThermally modified timber is wood that has been baked at around 200°C in low oxygen with steam, rather than treated with preservative. The heat drives out the resin and breaks down the sugars that rot fungi feed on. What you get is timber that moves far less with the weather and resists rot for decades, using nothing but heat and steam. No chemicals, ever, and nothing to reapply.\u003c\/p\u003e\n\u003cp\u003eIt also takes a dark finish beautifully, which is the other reason this one is black.\u003c\/p\u003e\n\n\u003ch3\u003eYour heater, and whether you want it on your phone\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eHarvia Cilindro PC90 9kW.\u003c\/strong\u003e The classic Cilindro pillar with the tall stone column and 90kg of stones. Controls built into the heater. £7,995.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHarvia Cilindro PC90XW 9kW WiFi.\u003c\/strong\u003e The same heater with MyHarvia app control, so you can start it from the kitchen or on the way home. £8,695.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe WiFi version comes with the Harvia door sensor fitted. That is not an accessory, it is what the electrical sauna standard requires before any heater is allowed to start remotely, and it is not in the box with the heater. A good number of quotes leave it off and the customer finds out later.\u003c\/p\u003e\n\n\u003ch3\u003eMood lighting, included\u003c\/h3\u003e\n\u003cp\u003eBoth LED runs are fitted as standard: one under the benches and one behind the backrests, plus the Harvia light fitting. Lit from below and behind rather than from above, which is the difference between a sauna you want to sit in with the door shut and a shed with a bulb in it. Most sellers charge £300 to £500 for this and charge it twice if you want both runs.\u003c\/p\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eLength:\u003c\/strong\u003e 200cm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExternal diameter:\u003c\/strong\u003e 235cm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeight:\u003c\/strong\u003e 240cm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 800kg\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeats:\u003c\/strong\u003e 4\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWall thickness:\u003c\/strong\u003e 44mm thermowood\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExterior finish:\u003c\/strong\u003e Coal Black\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBenches:\u003c\/strong\u003e Linden\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFloor:\u003c\/strong\u003e Terrace boards\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRoof:\u003c\/strong\u003e Two layer bitumen shingles\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRear wall:\u003c\/strong\u003e Solid as standard, glazing available to order\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUse:\u003c\/strong\u003e Outdoor only\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat's included\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eBarrel shell in 44mm thermowood, factory finished in Coal Black\u003c\/li\u003e\n\u003cli\u003ePre-cut wall staves and tension bands\u003c\/li\u003e\n\u003cli\u003eLinden benches\u003c\/li\u003e\n\u003cli\u003eTerrace board floor\u003c\/li\u003e\n\u003cli\u003eTwo layer bitumen shingle roof\u003c\/li\u003e\n\u003cli\u003eTempered glass door\u003c\/li\u003e\n\u003cli\u003eOne Harvia light fitting inside, two Harvia lights outside\u003c\/li\u003e\n\u003cli\u003eLED lighting under the benches and behind the backrests\u003c\/li\u003e\n\u003cli\u003eYour chosen Harvia Cilindro 9kW heater\u003c\/li\u003e\n\u003cli\u003eHarvia door sensor, on the WiFi version\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eAvailable to order\u003c\/h3\u003e\n\u003cp\u003eA 50cm length extension, taking it to 2.5m. Rear or front glazing in tempered, black or mirrored glass. A Bluetooth speaker system. Stainless steel banding. Alternative bench woods and exterior finishes from a twelve colour range. Tell us what you want and we will price the configuration properly rather than guessing.\u003c\/p\u003e\n\n\u003ch3\u003eBefore you order: your electricity supply\u003c\/h3\u003e\n\u003cp\u003eA 9kW heater is not a plug in appliance. Harvia specify a 3 x 16A supply on three phase, or a single 50A supply on 10mm² cable if your property is single phase, which most UK homes are. Over a buried run to a garden building that cable size usually needs to go up again for voltage drop. Budget for a qualified electrician and a Part P sign off.\u003c\/p\u003e\n\u003cp\u003eTell us your supply type and your main fuse rating and we will tell you what will and will not work before you commit to anything.\u003c\/p\u003e\n\n\u003ch3\u003eDelivery and site\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 800kg, palletised. You will need a way to move it from the kerb.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBase:\u003c\/strong\u003e A stable, level base must be ready before delivery.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAssembly:\u003c\/strong\u003e Self assembly, typically two people over one to two days.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eNot sure this is the right size for you? Read our \u003ca href=\"\/pages\/sauna-buying-guide-uk\"\u003ecomplete UK Sauna Buying Guide\u003c\/a\u003e, or message us and we will confirm the specification with you before you order. If you want the same build at three metres, see the \u003ca href=\"\/products\/steam-oak-vanne-3m-thermowood-barrel-sauna\"\u003eVanne 3m Thermowood Barrel\u003c\/a\u003e.\u003c\/p\u003e","brand":"Steam \u0026 Oak","offers":[{"title":"Harvia Cilindro PC90 9kW","offer_id":62559912165763,"sku":"HII2B-PC90","price":7995.0,"currency_code":"GBP","in_stock":true},{"title":"Harvia Cilindro PC90XW 9kW WiFi (incl. door sensor)","offer_id":62559912296835,"sku":"HII2B-PC90XW","price":8695.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0988\/1187\/1619\/files\/598.jpg?v=1788733097","url":"https:\/\/www.steamandoak.co.uk\/products\/steam-oak-hiili-2m-black-thermowood-barrel-sauna","provider":"Steam\u0026Oak","version":"1.0","type":"link"}