As water baths are quite pricey, I have been doing a little searching for alternatives and fell across one of these. The temperature range goes from 25 to 99.9 degrees and it appears that you can attach it to cooking pots or sturdy plastic troughs - I was thinking of using deep Gratnell trays if the volume is within 10-15 litres. This circulates as well as heats which is an added bonus. https://www.amazon.co.uk/Wancle-Imm..._2?_encoding=UTF8&refRID=AMRFGP0W6F7EKYE29Z4X What do you think? This one is costing £83.99 with Amazon. Something to to try maybe?