I happened to watch a recent Grasstec video of a farm with a new rotary, that was utilising gas to heat the wash water. The cost per kW was less than 1/3 of electric.
Presumably the gas uses instantaneous water heaters, which must be better than the electric one here, which is 27kW, with a rather underwhelming performance, heating water for calf powder, which takes about 10 minutes to fill a Wyevale feeder to about 40*C. Sparky has checked it and it is drawing the full whack.
Electricity use remains stubbornly high, despite a variable speed milk pump, decent high flow plate cooler and heat recovery on compressors. That leaves the vacuum pump and water heating to further investigate.
Does anyone have a gas system to heat their water, is it cheaper than electric heating?

I came across this older discussion and wanted to add that switching to a gas water heater might be more economical, especially if electricity prices have risen. Has anyone else here tried installing a gas heater recently? I'd love to hear if it truly makes a noticeable difference in energy bills and efficiency, especially for large tasks like heating water for farming needs.

Switching to gas for heating water might significantly cut costs compared to electricity, especially if it's used efficiently. In my home, switching over made a noticeable difference in energy bills. However, if you're experiencing continued high energy usage, you might want to consider consulting a professional. Also, ac repair in glendale helped me simplify maintenance of my HVAC system, which indirectly reduced my energy consumption further.