Their work is superb but i wish they had disclosed that the hourly rate was for only one of the plumbers and not both ended up having to pay more than i expected their work is solid! The flue gas collides with influent water before being discharged.â due to this occurrence, latent heat within the water vapour is then released. Q how much will a replacement boiler cost? Alk plumbing and drainage news, tips, advice. I never or seldom write reviews,.