If you're contemplating to build one or more ELCs - here's what parts costs you can expect.
Explanations:
variable costs: roughly 60-100 EUR per 10kW/230V, or 6-10 EUR per kW
Parts costs in EUR/USD
details for the price difference between remotehydrolight and fully equipped hydrocontrol on the basis of a 2kW unit
additional/different components compared to remoteydrolight
Barebones hydrocontrol
Ways to bring the price of the hydrocontrol down:
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Total price savings: 64 EUR
With all these price savings, the price difference gets down to 24 EUR. For these 24 EUR, you get a configurable ELC with display, keypad, optocoupler, triac with higher di/dt, discrete power supply, temperature sensors.