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You could try a search on hozelock fittings they do a range that will reduce 13mm to 4mm, granted it does depend on what you mean by 1/2" tho. any real 1/2" anti-syphon valve will cost a fair bit more.

Meant to post a link for a solenoid valve, http://www.amazon.co.uk/Hose-Hozelock-fitting-Solenoid-operated/dp/B003W5BGVC/ref=pd_sxp_f_pt A non electrical anti-siphon valve could also work such as is found in this link, cheap and simple [always a good a ideal]...

Generally speaking if the ballvalve is letting by then the ballvalve is faulty. However in your set up there could be another explanation. If the drip is very small, could it equate to the evapotranspiration of the unit being fed? How is the receiving tank feed controlled? Is it a simple...

If by 'a basin tap' you mean one 1/2" std basin tap then no. hope that helps. regards

I measure 2.26k on the one on my boiler [an apollo] and 2.11k on a spare coil, they are common to a number of gas valves. hope thats of help

Not withstanding all the above, it is worth with this boiler to check the pump impeller is clear. The flow rate through this boiler was always critical [as it is with many] I did often find a black glass hard deposit/s blocking the impeller, seemed more prevalent with the apollo for some...

You have the flow and return wrong way round. from a plumber who does know :roll: have fun

I would doubt its anything to do with the pumbing. Try running the machine on full cycle hight temp wash with nothing in it. Small cap full of bleach can also be useful. This will useully clear the bacterial growth that accumulates in the pump and hose areas.

Interesting point of view... I was taught that open voltage is important, or to be more precise the relationship between open and load voltage will assist in finding what is failing. Here is a table of voltages that will help to understand what might be going on. When testing a TC. it is also...

The thing with baths is the thickness, if its less than 5mm move on. Thicker baths are available at a price of course. The link you provide does not say what thickness and one of the reviews suggests that extra support was used. baths should have at least 5 point support if its less, then...

Open vent The arrangement you have shown will satisfy the general safety aspects, however the systemlink unit has auto vent facility, moving the open vent to the gravity side would eliminate the need to attend to any venting issues that might arise over time. By that I mean that auto air...

You do not mention if there is any form of heat sink connected to the primary gravity circuit. You mention that you vented the gravity circuit. You also ask “Would putting a vent on the gravity help circulation?” Is it reasonable to infer that this section of the system is not served by a...

Well orb don't you think mum is worth the little extra after all them years of love and attention :wink: seriously tho don't really think it matters, but i reckon grundfos are [in my humble opinion] the best you can get.

Just use a pump extension! Try here>> http://www.heatingcontrolsonline.co.uk/pump-extensions-p-680.html its a 50mm one... just job... :D

Air Because it is unlikely to be air in the sense you mean, it will hydrogen. It is a by-product of the corrosion processes that occur with the heating system. Kettling often caused by the process of localised boiling that then collapses as the local steam bubbles come into contact with...

Just use a vacuum cleaner to suck air through the various ends to identify what is connected to what. If there is an under floor connection between the primaries and the heating it will become apparent.

The air gap is irrelevant when the hot and cold main supply is mixed within the body of tap! Agreed ref the reduced flow hence suggestion re routing supply to provide balanced flows thereby eliminating need for check valves.

What you describe comes as no real surprise. You would be better fitting check valves to both supplies or better still providing a cold supply from the storage cistern to give balanced pressure and prevent backflow issues.

Cylinder stat issue. The position you note is normal, the inaccuracy of the stats operation is also normal. most of the mechanical stats of this type have an operating differential of approx 12c. ie +/- 6c from the set mark. The location of the stat on a cylinder will mean that the output...