There are a few things that you need to ask the professional that you are hiring, such as. Green - all is working seamlessly, no work is needed. We can supply a range of other top grade tanks so please call anytime for a chat ! Http://www.glow-worm.co.uk/trade/products/index-21952.html. The main application of the gsm module atmos ab01 is for automatic boilers burning pellets, natural gas or heating oil. Great job faster and satisfying. We offer boiler installations in leicester.