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Mining with solar panels and heating with a miner

Surplus solar power that would otherwise be fed into the grid for a few tens of hellers can be turned into cryptocurrency by a miner – and in winter the same machine heats your home like an electric heater. Power from your panels isn't free, though: it costs you as much as you would get for selling it to the grid. Work out how much a miner earns today at your price and choose a machine to match your surplus.

  • Surplus solar power
  • Heating instead of an electric heater
  • Quiet miners for the home
  • Hydro into the heating circuit
  • Revenue recalculated every hour
Calculate revenue Get help choosing

Summer: surplus solar power

Around midday the panels produce more than the house uses. A miner turns this surplus into cryptocurrency instead of a cheap feed-in tariff – in summer, duct its heat outside.

  • Solar power isn't free: it costs you what you'd get for feeding it in – in practice often only around 0.2 Kč/kWh.
  • With spot-price feed-in, the midday price is often close to zero. From January to September 2026 there were 278 hours of negative prices in the Czech Republic, most of them in April to June.
  • Your own consumption, a battery and a hot-water cylinder come first – they save the full grid price. The miner comes next.

Winter: heat from the miner

From November to February the panels produce only a small fraction of their summer output, so the miner runs mainly on grid power. Its value lies in the heat.

  • 1 kWh of electricity → roughly 1 kWh of heat, just like an electric heater or electric boiler of the same power.
  • If you heat with electricity, you pay the same for the heat – the mining earnings are a bonus.
  • A heat pump gives roughly 3–4 kWh of heat from 1 kWh. Where you have one, a miner won't produce cheaper heat.

How much a miner earns at your electricity price

Choose which electricity the miner will run on. We recalculate earnings every hour based on network difficulty and exchange rate.

0 Kč applies only to surplus you would otherwise neither use nor sell – for example above the export limit of a subsidised PV system. On such a surplus the miner will run mainly from spring to September around midday.

Hydro miners: heat into the heating circuit

Water-cooled miners transfer their heat to a liquid rather than the air. Via a plate heat exchanger they can be connected to a heating circuit, a buffer tank or water heating. They draw 5–8 kW and need a three-phase 400 V connection – too big for the summer surplus of a typical home PV system, they make sense mainly as a heat source in the heating season. The prices shown are for the machine alone, without heat exchanger, pump, cooler and electrical installation.

We don't yet install the connection to the heating circuit – customers arrange it themselves, ideally with their heating engineer. We're looking for heating-installer partners to carry out these connections. We'll be happy to advise on choosing the machine and the cooling parameters.

For the hydro miner: 12 kW water cooling for hydro ASICs – home mining and heating (21 499 Kč). For now, you arrange the connection to your heating circuit yourself – we will advise on the machine and cooling parameters.

Are you a heating engineer or installation company? We're looking for partners to connect miners to heating systems. Get in touch →

Earnings = today's earnings based on network difficulty and the exchange rate of the most profitable coin for the algorithm, excluding pool fees (usually 1–3%). Profit = earnings − electricity at the selected price. Earnings change; this is neither a forecast nor a promise of returns. For machines that can run at home or in hosting, we show the price for running at home. Recalculated on 25/10/2026.

What electricity from your own panels really costs you

Surplus solar power is worth what you would get for it elsewhere. If it would go into the grid, its “price” is the feed-in tariff. If you could use it at home, it is the full price of grid electricity. Only surplus that you would neither sell nor use is truly worth zero.

Feed-in prices for surplus from home solar plants are low. According to a comparison by Ušetřeno.cz (as of 15 January 2026), suppliers offer roughly 200–1,050 Kč/MWh, i.e. 0.2–1.05 Kč/kWh, often only to their own customers and sometimes with a monthly fee. With spot-based buy-back, the trader's fee is also deducted from the exchange price – 350 Kč/MWh at ČEZ. In practice, therefore, reckon with the lower end, around 0.2 Kč/kWh – and that is still a good price.

And the spot price at midday tends to be low. From January to September 2026 the Czech Republic had 278 hours with a negative electricity price, most of them in April (94), May (64) and June (47). In the first five months of 2026, Czech solar plants generated 17.7% of their electricity during hours with a negative price and almost another 6% at a zero price.

In addition, since February 2024 solar plants subsidised under the Nová zelená úsporám programme have been subject to an export limit of 50% of installed capacity. Whatever you don't consume above the limit is lost – and it is exactly this energy that is truly free for a miner.

In what order to use your surplus

  1. Your own consumption – washing machine, dishwasher, charging the car at midday. You save the full grid price.
  2. Battery and water heating – you use the energy in the evening or in the boiler, with small losses.
  3. Miner – once the battery is full and the water is hot, it earns more from a kWh than the feed-in tariff would.
  4. Export to the grid – whatever is left.

So don't power a miner from the battery at night. A kilowatt-hour in the battery replaces a purchase from the grid in the evening; in a miner it would earn only a fraction of that.

Winter: a miner as an electric heater that mines as well

A miner doesn't use up electricity “for good”. Everything it draws from the socket ends up as heat in the room – just like a panel heater or an electric boiler. A miner drawing 800 W heats like an 800 W convector, no more and no less.

In winter, however, solar panels produce only a small part of their summer output, and the miner will run mainly on grid power. It pays off where you would heat with electricity anyway: panel heaters, storage heaters, an electric boiler, extra heating for a study or keeping a workshop frost-free. You pay the same for the heat as with an electric heater, and the mining income comes on top.

If you heat with a heat pump or gas, a miner won't produce cheaper heat. You can find a calculation of the heat cost for a whole heating season in the article Heating with an ASIC miner.

Electric heater, miner or heat pump

Electric heater, electric boiler ASIC miner Heat pump
Heat from 1 kWh of electricity ≈ 1 kWh ≈ 1 kWh ≈ 3–4 kWh (coefficient of performance, COP)
Extra income none yes, depending on network difficulty and the exchange rate – see the calculator above none
Use of summer solar surplus only with water heating yes, controlled by the export flow water heating, cooling
Noise silent depends on the machine; home models around 33–55 dB outdoor unit
Control thermostat smart plug, power diverter, thermostat; takes a few minutes to start up own control system
When it makes sense as a cheap investment where little heating is needed instead of an electric heater and for solar surplus heating a whole house at the lowest heat cost

According to the manufacturer Bosch, the coefficient of performance of air-to-water heat pumps is 3.4–4.1 under laboratory conditions and tends to be lower over a whole season. A miner's earnings change with network difficulty and the exchange rate.

To sum up honestly: a heat pump gets the most heat out of a kilowatt-hour and a miner can't beat it. Against an electric heater, however, the miner wins – for the same electricity it gives the same heat plus income.

From our consultations

  • Customers with solar panels often put the miner in the utility room next to the batteries. In winter its heat keeps them at a comfortable temperature.
  • A smart plug or a remotely controlled circuit breaker usually works best: it switches the miner off as soon as the surplus ends, and you can monitor everything on your phone.
  • Size the miner according to the typical surplus on a sunny day, not the peak output of the plant. A machine that the surplus can't cover will draw the rest from the grid.
  • Large 3–5 kW ASICs are too power-hungry and noisy for a typical home solar plant. The exception is hydro machines connected to the heating system – but they make sense mainly in winter.

Sources

How to connect it

From surplus to a running miner. In brief – we'll go through the details for your home.

  1. Find your real surplusIn your inverter app, check how many watts you export to the grid on a sunny day and for how long. What matters is the output that lasts at least 3–4 hours, not a short peak.
  2. Choose a miner to match the surplusChoose a miner whose power draw is below your typical midday surplus. For a surplus of around 1 kW, machines up to 800 W suit; for 1.5–2 kW, the Avalon Q. Adjustable power helps.
  3. Control it by exportA power diverter, an inverter relay or a smart plug with metering switches the miner on when export exceeds its power draw and off when it drops. Set a delay of around 10 minutes so it doesn't restart with every cloud.
  4. Circuit protection and socketCurrent = power ÷ 230 V. Under continuous load use at most about 80% of the breaker rating, with no extension leads or multi-plug adapters. A machine of around 2 kW belongs on a dedicated circuit.
  5. Noise and placementQuiet machines up to 45 dB are tolerable in a living room; larger ones belong in a plant room, garage or cellar. Don't cover the miner and keep its air intake clear.
  6. Heat: outside or into the houseIn summer, duct the warm air outside (window, ducting), otherwise the miner will reduce its own performance. In winter let it heat the room. A hydro miner connects to the heating circuit via a heat exchanger – for now you arrange the connection yourself with your heating engineer.

Always leave connection to the distribution board, inverter relay or power diverter to an electrician, and connection of a hydro miner to heating to a heating engineer – we don't carry out this installation yet. A miner is a continuous 24-hour load – an undersized breaker, an extension lead or a blocked air intake are the most common mistakes.

Get help choosing

Tell us what PV system you have and how much you export to the grid. We'll recommend a miner based on your surplus and how you heat, and explain how to control it. We'll get back to you within 1–2 working days.

+420 792 480 835Mon–Fri 9:00–17:00

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Frequently asked questions

Is solar power really free for a miner?

Only the surplus you couldn't otherwise use or sell, for example above your export limit. Otherwise every kWh costs you the feed-in price you won't receive – in practice often only around 0.2 Kč/kWh, and around zero at midday spot prices.

How loud is a home miner?

Roughly 33–55 dB depending on the model; for example, the Avalon Nano 3S is rated at 33 dB by the manufacturer. A standard ASIC at 70–80 dB doesn't belong in living spaces – it's suited to a utility room or a soundproof box.

How much heat does a miner give off?

It converts almost all the electricity it consumes into heat – just like an electric heater with the same power input. An 800 W miner running non-stop produces about 19 kWh of heat per day, which is enough for roughly 15–20 m² in a well-insulated room.

How do I control a miner based on solar surplus?

Most often with a WATTrouter, a relay in the inverter or a smart plug that measures grid export. Switch the miner on with a delay of around 10 minutes so it doesn't restart every time a cloud passes. Leave wiring into the distribution board or relay to an electrician.

What about the miner in winter, when the panels barely produce?

It will run on grid power as a heater. It makes sense where you would otherwise heat with electricity: you pay the same for heat as with an electric heater, and the mining income is a bonus. It won't produce cheaper heat than a heat pump or gas.

Can you connect a hydro miner to my heating system?

Not yet – connecting it to the heating circuit is up to the customer, ideally with their own heating engineer. We're looking for heating engineers to partner with who will install the connection. We're happy to advise on the machine, cooling parameters and settings.

Is a home miner worth it without solar panels?

Only as a heater replacing an electric heater. At a typical price of 4.5–6.5 Kč/kWh, home miners currently don't cover their own electricity cost – the calculator on this page shows how much they earn from 1 kWh. For pure mining, our hosting is the better option.

What's the warranty and who repairs the miner?

New miners come with a 24-month warranty. Repairs are handled by our own ASIC miner service centre at Rostovská 260/2b in Prague 10 – we repair all models including hashboards, and diagnostics are free if we do the repair.

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