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From the research I have done, there can be a small let by of water via TRV's/joints or air being drawn in, other than that air is produced when the radiators rust which can affect pressures. In my example, my radiators are brand new and no visible water ever around joints or TRV's, but there...

Anyone else got any feedback as to how much they generally top up per year and why it can go down (if there are no leaks)

The vessel seems sufficient as I never get more than 0.3bar above cold even at full whack. I.e if system is on 1.2 bar cold, with boiler at 38kw, 7m on pump and all radiators demanding it will sit at 1.40-1.45. But what causes this loss other than leaks? Air releases from water so I suppose...

How much pressure are you topping up per 6months /year? How long does it take to settle down, 6 months? Mine looks to have 0.5bar of pre charge as per the manufacturers spec. (Flexcon) It says 6 bar- i presume i then have over 4 bar for expansion?

System boiler, vailant ecotek 438, 18L vessel. I wasn't looking for a comparison with exactly the same set up, just generally

I always wondered what is the normal amount of pressure loss with a sealed expansion vessel. All the manufacturers seem to state is that topping it up once or twice a year is normal. I have 30x15ft of UFH, 15 double radiators, 4 towel rails. I noticed when the whole system is first filled...

Thanks for the input. Mine is always set to winter mode all year round. As per above for hw I never found any benefit with the cc, the variable does boost up to 6m at times when I was watching it. John- Definitely only getting 0.4-0.5mh3 registered via the Q stat on the pump for HW as just...

My boiler return was around 58-65 iirc at 75 flow. Shame my boiler hasn't been wired set up to use the hw temp stat as i do have a separate control knob just for hw but its not used and only uses the heating temperature, then I could have split it. In addition, What i have done is put the timer...

the minimum heat input appears to be the same for the 438- 7.2kw - https://mans.io/files/viewer/492940/40 I experimented again with CC at 5.5 and the Q was between 0.3->0.5 m3/h, I put it on PP and it was the same values. Either way, the boiler seems to cycle once the tap gets to 54 ish in the...

When the boiler was cycling i set it back to pp, it did show 1.0m for flow. It's logged under q. Not sure why the flow shows as lower on initial heat up than what i saw on the previous cc test, but both settings still cause cycling at the end unless the temp is elevated to 77. How would i see...

This evening's run: Summary: It appears PP/ 15kw/67 degrees boiler flow works fine up until the last 15 minutes. i,e up to 53.9c kitchen / 54.7c bathroom tap It constantly cycles unless I put the boiler temperature up to 77c + Constant curve 8M head. This brought the taps up a further 1.8c i.e...

Proportional seems to also now be working, I think increasing the boiler temperature from 65 -> to 67c+ D0 from 22kw -> 15KW has allowed it to stop cycling as much and push the water out more gradual Before test: Water at tap downstairs circa 50 degrees, tank was last heated at 18:30 and not...

On constant curve- 5.5m Q= 1.1 m3/h S=3279rpm P=58w H=2723 h Yes, but is best to have the boiler on longer at reduced kw for longer or to run the boiler at a bigger kw for a shorter time?

The pp was definitely set at 8m. We previously heated the tank 1h in morning, 30 min at noon and 1h at night. It was set at 8M at 22KW D0. If I was to guess the taps were not more than 45c at that setting. The shower is on 40 degrees in our house but I only have it on for 1min to wash as I take...

In winter I set the boiler d0 to 30-38kw, dependent on how cold it is. the pump is set to proportional curve at 8m. In spring I set the d0 to 15kw as it's only heating the 300l water tank. I noticed the boiler often cycles constantly waiting on the pump and it can take over an hour to get the...

Thanks. That worked, unfortunately with the 'muff's' the tap is upside down, there's only one thread and I didn't want the tap or muff that loose to have it backed off half a turn. With the bristan taps the flow was 20% better. Have you got any suggestions for 3/4 taps with a male end...

Good to know, although the diagram for ' VAC PBSM C MT' shows them at 180mm centers? Hoping these will be just as unrestrictive - https://www.amazon.co.uk/Bristan-VAX-BIB-5412-Cross/dp/B00B9J0EPM/ref=sr_1_4?ie=UTF8&qid=1547143343&sr=8-4&keywords=bristan+bib+tap&tag=diynotcom-21 ? Any one have...

Thanks. Will see how these bristan's go, those Prestex ones are over £150 plus delivery. Half way to a brand new shower pump at that price :)

Thanks. Unfortunately those are pillar taps, so I can't get those on the wall. I think I will try these as they have no cartridge - https://www.amazon.co.uk/Bristan-VAX-BIB-5412-Cross/dp/B00B9J0EPM/ref=sr_1_4?ie=UTF8&qid=1547143343&sr=8-4&keywords=bristan+bib+tap&tag=diynotcom-21 Is there a...

Hi muggles, As per the above the flow rate is double without the tap connected and that flow rate is perfectly adequate. I am not worried about the pressure of the water coming through the tap to the bath, only the flow. The question is about an unrestrictive tap that doesn't cut flow by half...