Setting temperature on TE75 heater for beer kits

[mdd1967]

I want to brew beer kits in the garage so I bought a TE75 immersion heater (with inbuilt thermostat) to control heat. I am new to brewing and I think I made a rookie mistake. I followed its instructions, used water to set its temp at 21C, thinking that would give me 21C fermenting temp on kits suggesting 21C. My first kit fermented at 22-24 last week (some very warm days) and nights at 15C. I now know fermenting heats the liquid. Should I be setting it somewhere around 19C to get 21C fermentation?

 

[Gerryjo]

Set it to 19° and it should be fine. I set my fridge at this and no issues at all..

 

[mdd1967]

Thanks. It's a very fiddly dial on it but it's pretty good. I'll do that for my next one.

 

[mdd1967]

Just as an update on this I've not been able to set it down to the temperature. Somehow the control dial (I think) has broken though I was very careful making adjustments. I contacted Peco and they have been brilliant and are going to set the temperature for free and if it is broken they are going to repair it. A level if customer service you rarely see! Posted it off to them yesterday.