Thanks for printing! don't forget to come back to superior plumbing for fresh articles! This is a popular choice as our greenstar system boilers come with a free service after your first months. Call us on or alternatively use the form below and we will call you back! For example expect to pay more if you instruct a heating engineer employed by one of the ‘big six’ energy firms, compared to a smaller independent gas safe registered engineer. Looking for a service provider? Alfie & mick are brilliant,.