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It's ok now as you are going to hire a professional to sort you out, aren't you? James.

What flow rate do you have? Time how long it takes to fill a 1 litre jug from the hot water tap, repeat the process a few times and take an average. Then post your result. James.

I never notice the old threads until someone points it out. :roll: James.

I've started fitting the Spirotrap MB3's. 20 year guarantee, mainly composed of brass, baffles to filter non magnetic particles and a drain valve. James.

One of these then: http://www.plumbnation.co.uk/site/glow-worm-flexicom-35cx-combi-boiler-natural-gas/?gclid=Cj0KEQjws8qgBRCLp-aploLbqcQBEiQAm0rD55gehcWI1TLWMEDaS-A92YNk8Fs0mTSOsryZEkAQ8zIaAin98P8HAQ That c.£1,000 doesn't leave much for labour once cleanser, inhibitor, copper tube &...

What is the make and model of that boiler? James.

In theory it should be the opposite as the Logics and Kestons are virtually the same unit, but Kestons are more versatile with their positioning due to the twin flues. Don't get me wrong Kestons in their past had their faults, but when I carried out their warranty work, the majority of the...

If the flue is a problem, have you had a look at the, wait for it, Keston Combi? They are basically an Ideal Logic with the twin flue and a Keston badge. I used to do warranty work for Keston so I feel your pain. On the other hand, one of my former colleagues has a full time job with Ideal...

As Dan said, but add lovely thick insulation to the pipework, especially where the water will be circulated. James.

I doubt it. James.

Seen plenty of compression nuts split that way. I know I won't be the only one either. James.

Looks like one of those super dooper 15/20 minute services. If your 'heating engineers' call that a boiler that's been serviced annually then they are having your pants down. Didn't you hear them shout "Aye ho Silver!" as they left? James.

I'm going to have a look at the Spirotrap MB3 on my next few installs. Heard about some Magnacleans leaking on this forum and outside of the forum. James.

You seem confident that you'll be able to install 10m of 10mm without any fittings. Certainly doable though, I'm not saying it's impossible. Plus I'd have never thought that 10mm would be so workable. :roll: :roll: James.

Approximately 0.5Bar pressure drop over 10m of 10mm table x copper tube at a flow rate of 6l/min. This would give a velocity of around 1.7m/s though. This is based on a water temperature of 10°C. Edit: Excluding fittings. James.

What would steel say Dan? Something about keyboards? :lol: :lol: James.

In that case shouldn't the secondary circulation pump be left on continuous, I.e. not operated by a PIR or a time clock? James.

No problem, obviously pipe thickness varies considerably between manufacturers. For your needs, the heat losses involved will be negligible. Don't forget to include the pipework from the DHW cylinder to the start of the 10mm. James.

So following on with a flow rate of 6 litres/minute: To calculate how long it would take for the water at 0m to pass through 10mm pipe at 10m: Duration (s) = ((60 / Flow rate (l/m) ) x Total pipe volume (litres) ) = ((60 / 6) x 0.5024) = (10 x 0.5024) Duration = 5.024 seconds Again...

To find the pipe volume per metre, first work out the pipe area (internally). Using 10mm pipe with a wall thickness of 1mm: Area (m2) = Pi x ((Pipe diameter (m) / 2) - pipe wall thickness (m))squared) = 3.14 x (((0.01/2) - 0.001) x ((0.01/2) - 0.001))) =...