Mobile unit" direct number to engineer(no secretaries or hanging around) £5 fixed rates "any part of birmingham☎️ "no more-no less"☎️ free quote & free callout beat any quote (see areas we cover below) low cost fixed rate block. Baxi’s exclusive relationship with heatmerchants on gas boilers, ensures that the market leading baxi brand is available from a network of 30 branches countrywide the installer or homeowner is dealing with.