Sealminer A4 Ultra Hydro
Bitcoin & Bitcoin Cash ASIC Miner
886TH
HASHRATE
9.45W/TH
EFFICIENCY
8373W
POWER
£884.77
EST. MONTHLY
NO PAYBACK
EST. ROI
Image: SunBit · Original source.
Renewables and heat reuse
SunBit describes a 2024 installation in a 3,000 m² industrial hall. Mining heat works alongside an air-to-water heat pump, reducing reliance on oil. The site also has a 30 kW solar array.
- Project at a glance
- 3,000 m² hall · 30 kW solar array
- Source date and context
- 2024 installation, according to operator
- Published financial detail
- The sources reviewed do not include full project accounts.
- Our comparison
- A UK example per 1,000 miner kWh
About 5 minutes to read
Adding mining heat to a large industrial hall
SunBit describes a 2024 installation in a 3,000 m² industrial hall at Vimpeli. Mining works alongside an air to water heat pump, reducing the use of oil, and the property also has a 30 kW solar array. The reference identifies the equipment mix, but does not give the miner rating, annual heat delivery or audited savings.
“primarily heated by mining and the heat pump”
Oil, a heat pump and mining share the job
Solar and electricity supply→miners→hall heating alongside a heat pump
The comparison can change from one hour to the next. Mining may replace oil during one period and compete with the heat pump during another. Insulation, open doors, production hours and the indoor temperature all affect demand. Floor area on its own is not enough to size the installation or estimate a saving.
What the numbers could look like in the UK
The calculation below uses assumed UK prices to show how the costs fit together. It is our example, not this project’s reported earnings. Replace the inputs with current machine estimates and the costs at your own site.
Illustrative UK calculation
Income and running costs
1,000 kWh used by miners, plus 50 kWh for pumps and fans. All amounts in pounds.
Operating contributionBefore equipment and installation costs
£51.905.19p per miner kWh
Here, using the electricity for mining gives up a 5p/kWh export payment. That cost includes the 50 kWh used by pumps and fans. It is the value of an alternative sale, so it is not also charged as a grid electricity bill. The example assumes the generation equipment already exists.
| Mining income | 8p per miner kWh; an assumed rate, not a live earnings estimate |
|---|---|
| Electricity | 5p/kWh × 1,050 kWh = £52.50 |
| Pool fee | 2% of gross mining income |
| Useful heat | 60% of miner electricity = 600 kWh; valued at 6p per delivered kWh |
| Other running costs | £10 per 1,000 miner kWh; an allowance to replace with your own costs |
| Costs still to add | Equipment, installation, finance, tax, depreciation, major replacements and any costs above the allowance |
The contribution is what remains from mining income and useful heat after the stated running costs. It is not net profit: the equipment and other excluded costs still have to be recovered. Pumps and fans use electricity but earn no mining income in this calculation.
| Gross income per miner kWh | Without heat value | With useful heat |
|---|---|---|
| 5p | −£13.50 | £22.50 |
| 8p Chart example | £15.90 | £51.90 |
| 11p | £45.30 | £81.30 |
- Mining income needed to cover running costs
- 2.70pper miner kWh
- Highest electricity cost or export value supported
- 9.94pper total electricity kWh
These are two ways to read the same example. Adding equipment costs or a larger maintenance allowance raises the income needed and reduces the electricity price the project can afford.
Compare heating options and work out annual costs
Use the heating system you would actually choose as the comparison. For example, a heat pump using electricity at 20p/kWh with a seasonal COP of 3 has an electricity cost of about 6.67p per kWh of heat. A resistance heater at that tariff uses 20p per kWh of heat. These are calculation examples, rather than measurements from this project.
For an annual estimate, use the miner electricity expected during hours when running makes sense. Scale the contribution by annual miner kWh divided by 1,000, then deduct fixed annual costs. Recalculate if electricity prices, mining income or usable heat change.
Simple payback is the total installed cost divided by positive annual cash contribution. There is no payback under a scenario with zero or negative contribution. The sources reviewed here do not provide the full project accounts needed to calculate an actual payback for this installation.
Compare the heating source being displaced
Compare the marginal heat source hour by hour: replacing oil and replacing an efficient heat pump have different values.
Meter each heat source and allocate electricity consistently. Compare periods with similar weather, production schedules and door-opening patterns.
Questions worth asking
- What delivered heat cost does the heat pump achieve in practice?
- How much solar surplus remains after normal industrial consumption?
Try your own electricity and heat figures
Compare available miners and dated earnings estimates. Include heat only where you can use it or have a customer for it.
Sources and photographs
Sources checked on 29 September 2026. Project facts and quotations come from the publications below; the UK calculations and practical assessment are The Mining Shop’s analysis. This article is based on published material, rather than a site visit.
Photographs: SunBit (source).
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