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Hello Ollski It was only a shut-off valve. We have an extension and the heating was extended into it about two years ago. There are shut-off valves on the flow and return pipes so that that part can be isolated if necessary. Nothing else was touched. Ann

Hello and thankyou in advance for any help I have a Glow-worm 45 back boiler. The manual says it is an indirect system. I had a leaking valve to a pipe today. We drained the system, replaced the valve and refired the boiler. The boiler fired straight up and the heating is working...