Hi. I have a baxi 80he boiler which is constantly loosing pressure. It is not loosing pressure from the overflow it is loosing it through the condensation trap. I am having to top up the pressure twice a day. Had a heating engineer out to look at it said he would send me the quote through the post and all he sent me was the price for a new boiler. Contacted baxi they advised me to change the pressure relief valve. No joy. Can anybody tell me which part of the boiler drains water into the condensation trap so I can replace it please.