If you have a rigid pipe system connected to your stove and it was installed before 2010 there is a good chance that the pipe exiting the roof is not long enough. This stops your stove from receiving the optimum amount of air to make it burn efficiently. Before you blame the stove and waste money on a new one, you may want to try extending the length of pipe above the roof. In order to do this though we will need to know the exact make and model of the twin wall rigid pipe system as they are not interchangable.
Give us a call on 01462 431910 to arrange a free survey or send us a message from our website : http://woodburnerinstall.uk/contact-hetas-installer/