If you’re looking for controls for your gas regular boiler, your worcester accredited installer will be able to advise you. You can identify and compare a system's efficiency by not only its afue but also by its equipment features. Serving central maine since 1940. Flatirons plumbing has decades of experience and is your local plumber solution that are trained to repair or replace any plumbing issue we provide basic to complex projects and able to provide a fair upfront price. Which? says.