Gas, Plumbing and Heating Services Following many years supplying and fitting gas fires aided by Byron Day of Gas Check South West, in 2014 Grandisson and Gas Check joined forces to create Grandisson Gas Services. With Byron's 30+ years' experience as a heating engineer, we offer a complete service from installation of a full central heating system to replacing a washer! As with our fires and fireplaces we only offer the best products, and as such we are Vaillant Boilers Advanced Installers offering up to 10 years manufacturers warranty. We offer excellent prices for servicing of all gas appliances both Natural Gas and LPG.