What's the deal between Combi v Condenser Boilers?
The alternative type of boiler to a combi is a system boiler. Both combi and system boilers are condensing these days. System boilers store HW in a traditional cylinder. Combi boilers heat HW on demand. System boilers tend to be a little more reliable as they turn off/on less frequently. You do need to keep a HW cylinder though, so if space is at a premium most people go for a combi.