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Thanks for that. I had thought to make CF/OV changes myself as I have floors up - but it looks like I don't need to do anything under the floor, except perhaps cap of the old insert points of the CF and OV. Here's a revised drawing showing my take on a close coupled solution with a three port...

Hi. I'm refurbishing an old working system that still has a soon-to-be-replaced Netaheat heat only boiler. The old system has a tendency to suck air and develop stubborn air-locks. One reason being the rather long horizontal pipe runs. But the system design may also be at fault. I have...

Album with example ch system diags

This may need to change

Your point about the vent pipe (and the PRV) is well made. I know the vent pipe is insulated. I will check it though. I've certainly had the F&E cold feed blocked with magnetite. The same fate could have occured to the vent. The cure is to cut and replace. May I ask one question, do...

Good; I used PTFE (last half of the threads only) Now that I know it was a PRV, perhaps I'm wrong in my other guess about sucking in air. I have a top floor rad where I'm bleeding air out, but without the expansion tank ball cock complaining and topping up the tank. Could it be though...

What and miss out on a new water feature? I had the wjhole system down today to clean rads (even X800 for two days left enough magnetite to fill a bucket). Is it OK to use an old gas type tapered iron plug; I left the iron 3/4 to 1/2 inch adaptor in.

Thanks all. I've started the free the rusted and useless PRV task with Plusgas and Loctite freeze & Release. There is a vent tube over the Expansion tank. Lets hope its not blocked...... Brian

A strange object has been found fitted at the back of a boiler feeding a fully pumped 27 year old vented heat only system. Water dripping from this device is a hazard as it can enter boiler electronics. But what is it and can it just be removed and replaced with a blanking plug? It...

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