Discuss Viessmann combi starts when cold, mixer, tap is opened in the USA Plumbers Advice area at PlumbersForums.net
Thank you Shaun for your reply and solution.Needs a non return valve fitting on the cold to the boiler and a shock arrestor
Thank you Shaun for your reply and solution.
Might changing the tap from a mixer to two singles also cure the issue? {they are 45 years old!)
Reply to Viessmann combi starts when cold, mixer, tap is opened in the USA Plumbers Advice area at PlumbersForums.net
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