Mr Venom Posted January 10 Share Posted January 10 Hi all I was looking to get some advice on my boiler and heating setup - would really appreciate some input from the good folks here. In short, I have a 27kW WB Greenstar i System Compact Boiler, working with a 250 litre hot water tank and underfloor heating with two mainfolds across the house. Old Edinburgh build, 4m high ceilings and 140sqm. The hot water tank is set to 58 degrees and the UFH manifolds are set to 37-38 degrees. However, the boiler has been set up so that only one dial is used to control the boiler temperature (which is set on the "e" setting) - see photo attached. The hot water works fine but concerned that I cannot control the input temperature to the underfloor heating from the boiler. Does this mean that the input temp to the underfloor heating would be circa 60 degrees and then cooled down to 37 at the manifold? Or am I talking out of my rear end? Thanks, Mr V. Link to comment Share on other sites More sharing options...
Andehh Posted January 10 Share Posted January 10 Can you post pictures of your UFH manifolds please? I'd expect they have a temp dial and a mixing valve on them! Link to comment Share on other sites More sharing options...
JohnMo Posted January 10 Share Posted January 10 39 minutes ago, Mr Venom said: Does this mean that the input temp to the underfloor heating would be circa 60 degrees and then cooled down to 37 at the manifold? Pretty much how S and Y plan work. Manufacturer add lots of good features and the UK plumper f"**s it all up, by using S and Y plan plumbing. Link to comment Share on other sites More sharing options...
Mr Venom Posted January 11 Author Share Posted January 11 @Andehh - see attached. They do indeed have a mixing valve on them but concerned that what is going into the mixing valve is 60 degrees, which seems a bit overkill giving that the manifold is set to circa 38 degrees and that keeps the house pretty warm (though I notice the missus has adjusted the dial up slightly to like 40). @JohnMo - this work was done as part of my house renovation, I am still due the contractor/architect some cash and hence am inclined to ask that they rectify this as it seems a pretty inefficient setup and not inclined to pay for this in full until it is - what would be the best way of dealing with this? I should also note that I have two towel radiators in the bathroom/en-suite that are also supplied by the boiler. Link to comment Share on other sites More sharing options...
JohnMo Posted January 11 Share Posted January 11 If the design temp for the radiators 60 then that's the flow temp that you need. With mixer at 40 deg flow your boiler will need to deliver 50 degs or more anyway. Good thing is with a return temperature to boiler below 54 you will be condensing. Link to comment Share on other sites More sharing options...
Mr Venom Posted January 15 Author Share Posted January 15 @JohnMo - cheers for the feedback, a bit frustrating that it has been set up this way but appreciate the guidance all the same! Link to comment Share on other sites More sharing options...
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