Hello guys, it's my first post here in the forum. I decided to start this thread because I just got into brewing recently and I know for sure many of you will give me great advices so I can skip some stages. I'm currently building a fermentation chamber using a used chest fridge, it has 400L and it can hold 4 fermenters, I also bought a thermostat stc 1000 and I want to be able to also increase the temperature since it has dual control. I already have my cold source, now I need to get a hot source. After watching some videos and reading some threads I think my best option will be a tubular heater, but now comes the real problem that I've been facing for several days. I don't know what the potency (watts) should be. I have several options ranging from 45W, 80W, 90W, 135W, 180W, 240W, but the cheapest ones are the 90W option, and 240W. From your experience do you think I should go for 240W, or it will be way too strong and it can induce my thermostat into a yoyo effect? Thanks for your time.