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I am considering changing my heat only unvented system for a combi, the set up is follows: 3 Bed detached house constructed in 2011, 50mm slab insulation boards in the cavity (traditional masonry internal & external skin walls). Potterton 12 SL Promax heat only boiler. Family bathroom: bath...

Hi Andy, thanks for taking the time to respond. Due to the current demand from the boss for the heating to be available 24/7 I was not able to carry out the full drain down, mains flush & inhibitor re-fill, as soon as the weather/boss will allow I will fully drain down & re-fill adding X100.

Thanks Madrab, much appreciated.

Hi Madrab thanks for taking the time to respond. The system is S plan with an unvented Santon Premier Plus 170 litre cylinder. Manual bypass, LS valves fitted to both flow & return on rads in hallway & landing. Manual bleed on on the common return in the airing cupboard, AAV on the flow above...

I have a Potterton Promax 12 SL, it is the original boiler, installed in 2011, it is in good order & has just been serviced with no issues found. My system is S plan, I have a Grundfos alpha 2 pump which had been left on fixed speed 3, after some experimenting this has now been changed to PP2...

You reference a metal filter is your preference, as I only have 130mm between the 22mm elbows on the horizontal pipe many filters are too big, you referenced a TF1 as being a good piece of kit, after researching I found the FERNOX 62248 TF1 OMEGA FILTER SLIP SOCKET CONNECTION only requires a...

Thanks DP, yes if this boiler was in Yorkshire I am sure it would have worn out by now, thankfully the milder climate in Devon means that it is not on 24/7.

Hi Johntheo5, many thanks for this detailed response, I am now fairly happy with my rad balancing so as suggested I will now look at playing around with the pump speed & boiler flow rate to see what I can achieve while still keeping the boss warm enough & heating the water to a suitable safe...

Hi DP, thanks for the response, no HW demand off at the time of balancing the rads.

In a bid to get my system to operate to the best of it's capabilities I have been doing some research on boiler flow/return temperatures & balancing, based on what I have discovered I have made some tweaks to my system, my home set up is as follows: 3 Bed detached house constructed in 2011...

Thank you Madrab & John D for taking the time to respond, certainly plenty of detail for me to consider which is greatly appreciated, based on the excellent responses received to my first ever post I am now going to post again...

Hi Madrab Thanks for the detailed response. I had a basic understand of pipes 1 - 4 & your explanation has confirmed this for me. The tank is located in the airing cupboard on the 1st floor in the centre of the house, once the pipework leaves the airing cupboard it disappears out of view into...

Thank you Madrab for taking the time to respond, much appreciated.

Thank you JohnD for taking the time to respond, much appreciated.

Hello Everyone After picking up valuable advice from this forum over the years it is now time to post my first question... I would like to install a magnetic filter to my system, the heat only boiler is installed in the kitchen, the gap between the top of the boiler & the ceiling is tight so I...