Star boiler cover on new boiler installations. Most homeowners have experienced a temporary blockage or sluggish drains in their plumbing minor blockages often can be cleared with a plunger. We have a great reputation for excellent plumbing and customer service.. Tuesday to thursday 11am to 10pm. Many people ask us what a combi boiler does and if it saves money. Boiler in good condition been in flat for about 5 years but has been used for about 2.5 of them not sure.