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It means if you have a small header in the loft yo block the pipe over the top 22mm and the 15mm outlet on the bottom of it. This creates a vacumn. Are you sure its not comin from the tail that connects to the rad then and running down the valve?

They do mate but as i said earlier i think they need a min working pressure too as they need a 1,5bar pressure difference. So a min of 2bar (this could be standing i cant remember) The one in the link uses a pump, which makes me think it's W.P?

running the rads say 60/40 is effectively reducing the heat ouput of the rads, so fitting a slightly smaller boiler will have the same effect only it will work harder but more likely to be in condense mode. What does AFAIK mean bud\?

Why a pre-heat mate? How big is the house? You could always use a thermal store.

No i get your point completely mate. If the house requires 30k you give say 40k rads and 30k boiler. Therfore its undersized and produces a lower return temp as its working harder. I would generally fit a slightly smaller boiler to an existing system, again there are factors to take in...

We could really do with a pic/s mate tbh. Depenant on the size of the cylinder, that should take say 15-20k btu out of the equasion. How long do the boilers run for? Could well be suffering from reverse circulation. 22mm isnt big enough mate. The fact that he didnt want to notch the...

how much m3hr will 22mm flow at say 1.5bar? cant find any charts

How low? Pump failed? Air in system?

TUrn all rads off, turn system off, bung cold feed and expansion and snatch it. Bit of PTFE or paste. If its a pressurised system then just drop the pressure HTH

ahhhh clears that up cheers

Ask in any plumbers for a tap reviver kit, you get 2 in eack kit. 15 dabs all in

i really havent got a clue what yous are babbling about lol

Pipework undersized for sure. Pump definately undersized. LLH will certainly cure your probs. The heat from the boilers cant get away quick enough, you need to be carfull as you may warp the HEX's. If the house is in 22mm then it will not transfer 60kw away quick enough. The fact you have...

Who the bloody hell is puller? loads saying his name?

Your not getting my point tho mate. Turning it down isnt going to Give you your temp differential. Slightly undersizing will almost garauntee it. The rads should be sized right for the house or over.

LOL smart ass :D I didnt know that tho tbh hee hee The only reason i mentioned it is because most custs i seem to goto know that Potterton are owned by Ba i. When i was recommending Ba i they kept refering to the Suprima Watchdog review in which i have to e plain that the probs were...

Problem with the pin point on the Pressure washer is it will cause a change in brick color, may end up doing entire drive. Id go for brick acid and a wire brush. I take it you didnt notice until it had dried? Travis, build center sell it

Sounds like the return temps are too high so fitting the NRV's may cure that bit. When linking two boilers i would most certainly be fitting a LLH and shunt pumps or a reverse return setup. Another idea would be to fit another pump on the return to give the cooler water a bit of a push. I...

Who owns POTTY?

Totally agree LOL :D