Originally Posted by Sawdustguy
I was curious because I do not do on demand sparge water but I do 10 gallon batches with a 1500 watt element. It is more than enough to keep the mash temperature stable. If you are doing on demand I understand the element size. I don't step mash because the malts I use are fully modified and one would be foolish to step mash with a fully modified malt.
Electric hot water on demand is not very feasible.
With a 6kWh Heating element you could do about .8 gpm going from 120 * F to 170 * F
you could do about .35 gpm going from 50 *F to 170 *F.
For 5 gallon batches I guess it might be practical if you use your house hot water heater to start, but for 10 (or in my case 45 gallon batches), the flow rate starts to become less practical. Especially sine I dont have hot water where I brew.