Ok without a Watt rating on the heater element I won't be able to do anything but guess.
IF this URN comes with a 600 Watt heating element, in a perfect world brew session:
If have to raise 50 degrees C to reach Mash Temp (say assume water already 16 C): 52 minutes.
If you have to then raise to Boiling to start the boil (say assume Mash temp is 66 C): 35 Minutes
Time at full energy required for heating 1 hour 27 minutes. (close enough to 1.5 hours) = 0.9kW electricity
Amps hit on your circuit = 2.5 Amps
Add partial electricity over the Mash time and Boiling Time and add to 0.9kW for total electricity consumption per brew.
Note: If buying three of these say to get 26 Litres of hot water for a full size batch then tripple the amounts used for electrical consumption but assuming all three running at once the times will be the same.
NOW IF this URN comes with a 1000 Watt heating element, in a perfect world brew session:
If have to raise 50 degrees C to reach Mash Temp (say assume water already 16 C): 30 minutes.
If you have to then raise to Boiling to start the boil (say assume Mash temp is 66 C): 21 Minutes
Time at full energy required for heating 51 minutes = 0.85 kW electricity
Amps hit on your circuit = 4.16 Amps
Add partial electricity over the Mash time and Boiling Time and add to 0.85kW for total electricity consumption per brew.
Note: If buying three of these say to get 26 Litres of hot water for a full size batch then tripple the amounts used for electrical consumption but assuming all three running at once the times will be the same.
Again need an actual heater element rating to get an exact answer.
I think I should put this and BTUs for NG/LPG in my brewing program I'm writing, seems handy enough to evaluate which gear to get next.
EDIT: 600 Watts is about 2,048 BTUs per hour. Drawing 2.5A
EDIT: 1000 Watts is about 3,412 BTUs per hour. Drawing 4.16A
EDIT: 2400 Watts is about 8,190 BTUs per hour. Drawing 10A
EDIT: 3600 Watts is about 12,283 BTUs per hour. Drawing 15A
EDIT: 4800 Watts is about 16,378 BTUs per hour. Drawing 20A
A 6" Jet Burner can develop 100,000 BTUs of heat
A 8" Jet Burner can develop 200,000 BTUs of heat
A 10" Jet Burner can develop 320,000 BTUs of heat
A 14" Jet Burner can develop 440,000 BTUs of heat
A 19" Jet Burner can develop 880,000 BTUs of heat
Of course you have to calculate losses due to restricted size of gas pipe to NG, or regulator restriction of flow to LPG and the caloric difference between NG and LPG and the loss in transferring heat to the pot through a set distance through the air... yadda yadda yadda but lots of room to get efficiency raises
A 19" will scare the **** out of your neighbor for sure
Jet Burners The high heat jet burner has been around since the early 1900's and has proven to be one of the best systems for applications that require a great deal of heat. These high heat, cast iron jet burners can produce up to 432,000 BTU of heat per square foot of burner area, require no adjustments, and develop temperatures of up to 1900 degrees F. Roofing contractors use the big cast iron jet burner as a roofing tar pot heater and asphalt heaters . Imagine the uses of jet burners like this in outdoor cooking when you need to get a really BIG pot up to temperature right away. The high heat cast iron jet burner will be shipped outfitted for propane use unless the natural gas version is requested. Optimum distance from burner tips to cooking surface is 16". These big, bad cast iron burners are hard to find and they deliver serious heat like no others.
Cheers,
Brewer Pete
