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Viessman 222- f - 1 year down the line time to service this ready for winter hasn't been any trouble but not the most enjoyable task everything is so awkward maybe it will be easier next time . Kop
Wasn't a easy install and definitely a pita to service but their bills are lower and weather compensation has worked well the customer is tec savy so no worries with the app . KopLooks an awkward one, I'll not be fitting any of those