Location: Somewhere in northern Germany
I have built a "heater" which digs Bitcoins for me and warms my living room at the same time. Since I spent quite a bit of time on this project and it wasn't clear in the beginning if what I came up with will work, I would like to present the project so you can benefit from my experience.
I run 2 hashboards. These have a hashrate of 9.4 TH/s and would generate 0.00000220 BTC / hour according to a mining calculator. With an electrical power of 0.78kW.
Let's say we produce 1000kWh of heat with the hashboards. Then we have to run the hashboards 1000kWh / 0,78kW = 1282 hours.
This costs us 0.27€/kWh * 1282 h = 346€.
We get 1000kWh in heat and 0.00000220 BTC/h * 1282 h = 0.0028204 BTC
So at a rate of 50000€/BTC we get 141€ in the form of bitcoin.
Compare this with gas heating:
1000kWh gas heat costs 90€
1000kWh Electric heat costs 346€ and we get 141€ in Bitcoin so 346€-141€ = 200€.
The rate of Bitcoin would have to be around 90000€/BTC for it to cost the same as gas heating.
Gas price about 0.09€ / kWh
Electricity price about 0.27€ / kWh
Bitcoin price about 43700€/BTC
Green electricity share in the power grid about 45%.
Hardware:
Antminer S9j (3 hashboards) with power supply.
30 liters tin bucket
20 liters Addinol white oil WX15
Radiator height: 60cm width: 80cm depth: 12cm
Fabric hose, pipe fitting etc.
Hot water pump
Small PC fan
Fan Simulator
At first I wanted to operate the power supply in the oil (see the picture of the aluminum frame).
But since I did not know how the thing runs, I have the power supply first left out.
Conclusion:
The system has been stable for a few days now. I usually use it in the morning and a couple of hours in the evening, when I am at home.
The fan of the power supply I have also throttled a little (5 diodes soldered into the line of the fan) so he is still a little quieter. The volume of the hot water pump is very low. This I operate with an old notebook power supply with 19V. I bought the 24V version, there is also a 12V version. The power supply is the loudest component.
The radiator I bought used. Keep in mind that in the radiator may be impurities which are then deposited in the bucket. This was not a big problem, but I recommend to consider this and maybe install a filter in the beginning. In the oil I also operate a small fan that circulates the oil. Thus, the temperature in the bucket is evenly distributed.
After about 3 hours, the system is at maximum temperature. The oil temperature is then about 58°C, the chip temperature of the hashboards is max. 86°C and the radiator is about 45°C. The outside temperature is about 0°C at the moment and the Bitcoin heater manages to keep about 21°C in the living room.
Next I will build a platform with casters and put the system on it. I plan to run the hashboards in spring with my own photovoltaic modules to reduce the mining costs.
It is an interesting project and I have gained some experience.
If you found this post helpful and maybe want to donate some satoshi here is my bitcoin address:
1DhNAhyd69PuqodLGCX4hz2EqGugFkqrPy
Otherwise, stay healthy and HODL
feel free to ask questions
Aluminum frame to support the hash boards in the oil
Submitted December 05, 2021 at 10:34PM by Special_Inspector590 https://bit.ly/2ZW7Vr8
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