Hello - I recently got a new Worcester Greenstar 30i 30kW Combi Boiler 7733600005 installed in my property. Previously I had a 37KW combi boiler but that was 10 years old. But my plumber said that 30KW combi boiler should be more than enoguh. The day this was installed, I also had my water supply pipe changed from 15mm to 25mm PE to increase the water flow. Since the day these two things were done, my hot water cycles continuously between extremely hot and freezing cold in all the tap mixers. I am not sure what's gone wrong as the plumber who fixed it confirms that this has nothing to do with the boiler. Any pointes / advise based on your experience will help.
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