News from Engineering that when they pressurised the system they found a split in the calorifier. Jenny said it must have happened between the survey and Jon finding the water filter split but there was no way of knowing at the time because of the freeze. Doubt whether I have any comeback at this distance. Have to check with Ellie.
Manual says the calorifier is 13 gallons. Chandlers don't seem to have that size. 55 litres = 12 gallons. Contacted Aqualine who will let me know which make to go for, and whether to go up or down in size if that needs to change.
