21energy Bitcoin Central Heating
- Hashrate
- —
- Power
- 7,000 W
- Efficiency
- —
- Noise
- —
No price found yet
Water heater Floor standing In production
Constellation Heating Constellation Heater 400T
A bitcoin-mining boiler from Québec-based Constellation Heating: S21 miners sit in a dielectric fluid, and a titanium heat exchanger passes their heat to pool, radiant-floor or other water loops. The 400T is the middle size, giving 8 kW of heat and 400 TH/s on a 220/240 V, 50 A circuit. It is sold by quote in Canada and the continental US, must be installed by a professional and has a 12-month limited warranty.
Hashrate400 TH/s worst 250 GH/sbest 1.16 PH/s 45th best of 197 (the bar uses a log scale)
Power (stock)8,000 W lowest 11 Whighest 22 kW 18th highest of 199 (the bar uses a log scale)
Efficiency20 J/TH worst 100 J/THbest 8.9 J/TH 121st best of 195
Earns per kWh$0.076 worst $0.010best $0.171 120th best of 195
Heat output27,297 BTU/h worst 38 BTU/hbest 75,067 BTU/h 18th best of 199 (the bar uses a log scale)
Noise—
Price per TH—
Where to buy
No store listings yet. Know where to buy it? Tell us.
Heat, running cost and sats
- Heat per day
- —
- Electricity per day
- —
- Mining earns per day*
- —
- Net cost per day
- —
- Net cost per kWh of heat
- —
- Solo: chance of a block per year
- —
- Earns per kWh, on 3-month averages
- —
- Payback
- —
The maker gives no hashrate for this mode, so we can't work out its mining income.
*What a pool would pay on average at today's difficulty, block reward and bitcoin price, before pool fees. Solo miners usually earn nothing, and very rarely a whole block. A plain electric heater turns the same electricity into the same heat, so the mining income is what makes the difference.
Payback is how long the bitcoin a device earns takes to add up to its price. It leaves out electricity, which buys the heat: compare earnings per kWh with your electricity price to see whether mining alone covers it. It uses the average of the last 3 months, to 12 Nov 2026: bitcoin at $79,558, 969 EH/s on the network and 3.15 BTC a block, less a 2% pool fee, for the hours you set. It cuts the block subsidy in half at each halving, the next around Apr 2028, and otherwise assumes those carry on unchanged, which they won't. Income at today's difficulty and price is about 17% below that average. Hashrate usually rises, though miners that stop paying after a halving may switch off, which leaves more for the rest. How we work it out.
Specifications
| Brand | Constellation Heating |
|---|---|
| Model | Constellation Heater 400T |
| SKU | — |
| Type | Water heater · Home * |
| Form factor | Floor standing * |
| Cooling | Immersion |
| Production status | In production * |
| Launch date | — |
| Hashrate | 400 TH/s |
| Power consumption (stock) | 8,000 W * |
| Mining efficiency | 20 J/TH * |
| ASIC chip | Bitmain BM1368 (reported by an independent source) |
| Miner inside | Bitmain Antminer S21 (the maker says 'S21 ASICs included'; variant and number of miners per model not stated; cabinets are listed for 2 or 3 miners) |
| Heat output | 27,297 BTU/h |
| Input voltage | 220/240 V (50 A circuit, NEMA 14-50 plug) |
| Frequency | — |
| Net dimensions (W × D × H) | — |
| Net weight | — |
| Noise | — |
| Operating temperature | — |
| Hot water | About 172 L (45 US gal) an hour, from 10 to 50 °C (our estimate) |
| Colours | — |
| Company based in | Canada |
| Made in | — |
* Not confirmed by the maker's own documents yet.
Features
- S21 bitcoin miners and Liquid21 immersion fluid included
- 8 kW continuous heat
- Titanium heat exchanger for pool (chlorine or salt), process or glycol-loop water
- Fully modulating: Eco, Normal and Auto modes
- No fans (immersion-cooled)
- 8" 1024×768 capacitive touchscreen with live heater and Bitcoin blockchain display
- Ethernet or Wi-Fi (2.4 / 5 GHz)
- Phone app, no account needed: Bluetooth setup, remote control, safety alerts
- IP65 enclosure, over-temperature protection
- 220/240 V, 50 A circuit, NEMA 14-50 plug
- Mines on Luxor's FPPS pool through a subaccount Constellation manages
- Fees: Constellation 3%; Luxor 2.8% on the products page, 3% in the terms
- Payouts weekly or monthly to your own Bitcoin address
- Miners run LuxOS firmware
- Professional installation and a pre-start check with Constellation required
- Assembled heater not UL or CSA certified (built from UL-certified components)
- Uses: pool, radiant floor, hotel and central water heating, maple syrup production, micro brewing
- 12-month limited warranty
Reviews
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Sources and data notes
- products page (200T, 400T · 8 kW and 600T models; 200–600 TH with S21 ASICs and Liquid21 included; Eco/Normal/Auto; 8 in touchscreen; Ethernet or Wi-Fi; titanium heat exchanger; IP65; 220/240 V, 50 A, NEMA 14-50; Luxor 2.8% and Constellation 3% fees; 12-month warranty; 2- and 3-miner dimensions; quote on request, no price) constellationheating.com
- home page (4, 8 or 12 kW and 200, 400 or 600 TH; immersion cooling with no fans; titanium exchanger for process, pool or glycol water; applications incl. maple syrup and micro brewing; serving Canada and the continental US; product and interior photos) constellationheating.com
- profitability calculator (400T · 8 kW is the default model; energy used equals heat delivered; Luxor fee 2.8%, Constellation fee 3%) constellationheating.com
- calculator model data (400T: hashrateTH 400, powerKW 8, used as the electricity drawn) constellationheating.com
- terms of service, updated 2026-09-30 (Constellation Heating Inc., Quebec; sealed oil-immersion heater for water or a heating loop; professional installation and pre-start check; assembled unit not UL/CSA certified; Luxor FPPS pool fee 'currently 3%', 97/3 split with Constellation; weekly or monthly payouts; one-year limited warranty from delivery) constellationheating.com
- app privacy policy (miners run LuxOS firmware on the Luxor pool; no account; Bluetooth setup; remote access over Tailscale; offered in Canada and the US) constellationheating.com
- distributor page (Canada and continental US; sold direct or via partners; no partner stores listed) constellationheating.com
- contact and quote form (based in Québec, Canada; 'becoming an early adopter') constellationheating.com
- Corporations Canada federal company record: Constellation Heating inc. (also Constellation Chauffage inc.), corporation 1483013-0, incorporated 18 April 2023 under the Canada Business Corporations Act, registered office in Champlain, Quebec, director Nicolas Drouin-Audet, status Active, annual returns filed for 2024-2026 ised-isde.canada.ca
- Compass Mining podcast episode page, 29 April 2025, with founder Nicolas Drouin: chapters on pool-heating economics, S19 and S21 form factors and where Constellation's customers are; no figures www.audioscrape.com
- ASIC chip: product page: 'S21 ASICs included', '400T · 8 kW', 2- and 3-miner cabinet sizes; miners per model not stated constellationheating.com
- ASIC chip: homepage: 'S21 miners included'; 400 TH model; no variant named constellationheating.com
- ASIC chip: calculator model table: 400T = 400 TH, 8 kW; no miner fields constellationheating.com
- ASIC chip: Braiins OS hardware table: 'Antminer S21' = BM1368, 3 hashboards x 108 chips academy.braiins.com
- ASIC chip: D-Central S21 repair guide: BM1368, 108 chips per hashboard, 3 hashboards; S21 Pro/XP use BM1370 d-central.tech
Not yet confirmed from the maker's own documents: power (8 kW is the published heat output and the draw the maker's calculator assumes for the 400T; no rated electrical input is published); efficiency (not published; 8 kW / 400 TH/s is 20 J/TH); dimensions (maker lists 27.7 × 22.6 × 17.2 in for a 2-miner unit and 35.8 × 22.6 × 17.2 in for a 3-miner unit but not which one the 400T is; two 200 TH/s S21s would make it the 2-miner unit, about 704 × 574 × 437 mm); weight; noise (maker says no fans and no noise; no dB figure, and the unit has a circulation pump); operating temperature (no ambient range or water temperature published); frequency; where it's made (terms only say it is built from UL-certified components); colours (photo shows a light grey case with a black corner panel carrying the logo; no colour is named); form factor (from the product photo: a box on short feet; no mounting is stated); launch date; production status (sold by quote; no lead time or delivery date is published, and the contact page mentions becoming an early adopter; a 2025 podcast discusses where Constellation's customers are, so earlier heaters were sold, but no outside source shows a 400T delivered); images (the same photos are used for all three models); category (also offered for hotels, maple syrup production and micro brewing).
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