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Its not the silliest but taking the yellow stopper out would be! No, leave it in it helps reduce air.

http://www.heatraesadia.com/docs/Megaflo_systemfit_-_Issue_5_-_36005882.pdf Look on there about page 30 - 31 Most definitely sounds like either no by pass fitted or not set properly When your system starts making this noise open the by pass slowly until it stops, which is kind of what...

Just sounds like its not sealed properly when he changed the head for the new one, 5 - 6 days for something that may be his fault is a bit out of order in my opinion i would attend that before doing any other work for my peace of mind. The noise is more likely air, if your constantly topping...

Please get someone round to look at it all for you, if you dont know the basics and are confused by draining it down i wouldnt recommend playing around with your system it could end up costing more to put your work right than doing it in the first place

http://www.worcester-bosch.co.uk/installer/products/gas-boilers/greenstar-18ri is what id offer you if you were my customer depending on heat requirement. Running an extra supply for pump over run is noting compared to the work involved in changing from your current system to a combi and...

Have you checked the discharge pipework? It should be the copper one outside, check it to see if theres any sign of water coming from it. Obviously to lose pressure the water is going somewhere so try that first mate, just try checking your rad valves for small weeps etc too

back on the 35mm