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Err.. Ok

I'm not sure if the EV falls under G3 requirement or not. Regardless, though, the procedure is the same as for the heating system's EV. Close the water supply to the EV, release the pressure on it by opening a tap branched off of it. Then check the pressure through the schrader valve and add...

Is he powerflushing? If so, that is very time consuming and may explain the price. Otherwise, it's a case of refilling the system with water, adding inhibitor, bleed the air out, and switching it all on. If there's any problems, that's when you may need to call someone in. You'd also want to...

Two trains of thought on this: 1. Fully open to give HW priority so that the cylinder heats up as quickly as possible. 2. Balanced so that the heating is still able to function concurrently with the cylinder. This is trial and error. With both HW and heating running, close the valve down until...

Set your boiler to be 10 degrees higher than your cylinder stat, to allow sufficient heat transfer without the boiler hitting its stat before the cylinder does.

I don't know the specifics of your boiler, but usually the HW dial is only for combi boilers. The CH dial controls the temperature for both heating and the HW cylinder. If your programmer for HW is on and the thermostat is above the current HW temperature, the HW zone valve should open and the...

It's an indirect cylinder and the boiler flow is to the left of the bottom immersion and the return to the right of the bottom immersion.

What model is the Megaflo? If it is direct, it will be immersion only. If it is indirect, it will have a coil running through it with flow and return pipe connections to be heated from the boiler - some pics here would easily identify it. Indirect cylinders have an immersion heater too - but...

Tapworks AD11. Approx £430 + fitting.

20 lpm is usually considered the minimum flow rate. Was the flow rate measured at the stop cock? If it was significantly more, you should definitely have 22mm pipework to the cylinder. You should also have as much 22mm to your outlets as possible, especially to your shower.

Did you look at post #2 ??

See my post #3 above. By moving the sensor higher in a vertical cylinder, all you are doing is effectively reducing the temperature at the bottom of the cylinder. This still does not overcome the legionella issue, unless you ensure the whole cylinder is heated to 65+ at least once a week.

The VR65 instruction manual explicitly states compatibility with the VRC400 series weather compensator. However, you may be right about an incompatibility - I don't have personal experience. It does seem, though, that others have reported the "mid-position" not working when the VR10 thermistor...

I don't disagree - but thought, if it's fairly simple to achieve, then why not?

A friend is having 2 new combi boilers installed in a house which is setup as two dwellings. The combi's are replacing an existing gravity setup with two separate boilers. There are also 2 gas meters, if that matters. Both dwellings have their own CH flow/return and HW/CW pipes. The owners of...

If you have a VR65 (or similar Vaillant control center), there is a setting to allow both heating and HW at the same time. The cylinder will then take longer to heat up, but you won't lose heating - as long as the HW circuit is balanced accordingly.

If you have thermostatic showers, you could reduce the cylinder temperature, which would mean it heats up faster. This would result in a higher hot to cold ratio when using the shower, so the hot water would run out quicker. You are constrained by having to have the cylinder heated to 60...

Probably 1 1/4 inch. Either buy another one of those or just get a 28mm compression valve: https://www.advancedwater.co.uk/header-520-467-315IREDUCER.html

I've heard this (in bold) a few times - I suppose it is possible a home insurance policy may refuse to pay out if the Gas boiler was directly responsible for whatever damage is caused, I've yet to hear of a single instance where this has actually happened. This is for residential owners of their...

Yup, definitely a tangent.