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We fit baxi stuff and have for about 20 years, the duo tec the previous version of the new upgrade boiler was great.
Honestly depends how long a warranty yiu want.
Either get a main 30(5 year), 600 7 year or a 800 10 year. You’re paying for the warranty at the end of the day and every engineer will have there own preference.
They are easy to work on and fault find, they are full of brass parts and honestly we can’t fail them.
Like all boilers stuff fails. I’d personally avoid Worcester boiler. Live on the name, pay the premium for imo a sub standard product
Thanks re. boiler tips above - assuming the worst, what's a good combi to replace with?
3 bed terrace. Currently the GlowWorm Ultimate 30c - we moved in about 3 years ago, don't know when previous owners installed. Would kind of like to try out Nest or some other smart thermostat - currently a clunky low battery Samsung thermostat. (Thermostat still turns on btw so am assuming just because it's flashing low battery doesn't mean the boiler won't work? Or will it?)