Please note cookers, stoves, boilers & fires will have to be switched off at a suitable time before. We are a local family plumbers located in ls16 leeds we cover all types of maintenance and. Get to the bottom of the problem. Combi boilers from 24kw to 40 kw, that can deliver a domestic hot water flow rate up to 16.4 litres/minute. A broken or faulty boiler doesn’t necessarily mean a whole new system is required, there are many reasons for any central heating system to degrade.