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Hi, I have a gravity fed water / CH system powered by an oil fired boiler. The CH is pumped. I am replacing very out of date controls (that are on their way out). There is currently no room stat, just a simple programmer feeding the boiler (W) and Pump (CH mode). I have purchased a...

Hi, I am new to the forum and new to CH systems. We moved to a large property with c. 15 radiators on a single level operating from an old oil fired boiler. Many of the rads only get hot at only the top 5-10 cm and I was thinking of flushing and refilling with the preventers etc. I have...