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Deleted member 105431
I justed wanted to thank everyone for their time in responding to my question and provide an update on what happened.
I've got the boiler replaced with a Vaillant Ecotec 831. Went with a Corgi approved guy. All the quotes were approximately the same. A few teething problems atm but they should be sorted out soon.
You made an excellent choice, you won't regret it.