Why use ahp boiler services for all your boiler and central heating needs? Baxi he combi boiler exellent working order conplete. A plunger and and bit of arm action! Subject to an annual service at the customer's expense year warranty option only available on worcester bosch and ideal gas boilers. If you want to keep your boiler in tip-top condition for longer, annual services are the way to go they help to keep your boilers.