Here is my Update...
OIL COOLED

I do not give a guarantee. Immerse in oil, maximum frequency or maximum voltage.
The risk is yours alone.

Futurebit with Fullnode submersed in oil!
https://i.imgur.com/pz8ExTN.jpg
Meine Settings
Custom Mode 858Mhz on max
Hashrate 146 - 151Mh/s
Temp 54 - 69°C depend on FanSpeed to cool the oil.
here is a Dashboard picture. I crop it  
https://i.imgur.com/G8IH9r7.jpg

The Power usage from the Wall is 311W. The Miner use around 260Watt

Mode               | EcoMode |  Balance   | Turbo
Hashspeed        |100Mh/S  | 127Mh/s  | 137Mh/s
Hardware Error  | 0,1%      | 0,2%       | 0,5%
Hashboard        | 46°C       |  52°C       | 58°C
MCU Temp         | ---------- ca. 41°C -----------
Fanspeed ca.     | 1400       | 1800       | 2100  
Power Wall        | 120         | 160         | 210

The electricity from solarpanel is stored in batteries for the hole house. Power is for free!
I get from Powerdelivery 0,12€ / kWh so i will make profit   its better to use it.
My earnings are in Custom Mode 0,35 - 0,40$ on Prohashing.com