I am getting a 2400 watt immersion heater and I need to work out how long it will take to heat a 40 lt pot of water to 75c. My water temp is around 18c. I am going to set a timer up so that I can mash in when I get out of bed in the morning
Does anyone have the formula to calculate this??
Andrew, I am no Einstein and can not give you equation as to how long. On the other hand, I can give you an idea of how long it took me the first time (which happened to be yesterday). This is what I did:
On Friday night, I filled my 60l kettle with 40L of cold water, ploncked my immersion heater (2400W) in it on a string to ensure that not all of it is immersed. (the bent arm sits nicely on a string, set to your height). Next, I set my cheap Arlec timer to activate at 4.30AM and swtich off at 7AM, the time I intended to get up. I happened to get up slightly earlier and decided to check how the timer went. It was boiling at 6.45AM. Since this was a first time try, I can only tell you that it takes less than 2 hours to get it up to mash in temp. Teherfore, next time I will set the time accordingly and adjust it until I am close to what temp I need.
I hope that helps.
Bye the way, I have to think of immersing the element a different way. Since I had a lid on the kettle, I found that the steam was sufficiently hot enough to cause me concerne about the electrical lead tthat was within the kettle. Even the bacalite or whatever material that was within the inside of the kettle was a tad hot. Probably no great concern as I always switch those things off when I move it..