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Typical problem with a boiler without a plate; regulating the temperature in the hex and causing scaling in the tubes. Remind me again why they are better?

White key is obsolete. Agreed it was awful, but it was replaced some time ago.

You can link Evo on a Vaillant combi and their own weather comp.....

Take the actuator off the 3 port valve and select heating manually, using the brass valve spindle. Has been known that the valve is only just opening a tadge to CH, rather than fully, causing low water flow.

Not an oil boiler then?

So if you had 10 filters, they wouldn't impede the flow either?

thanks. as part of this test, do I also need to send a live to the relevant terminal on the cylinder demand terminal box? am I correct to assume that is there to tell the modulation logic to stay out of the way, and thus makes the difference between the boiler running in CH-mode, cool and...

PL= Permanent live. In other words, try removing all OT stuff and running the boiler into the Pandora only, with the zone valve wedged open. We've fitted a number of Pandoras (whilst DPS were extant) and it is a great product. It is just a cylinder as far as the boiler is concerned. WB1B is...

aquavac

Viessmann interfaces are a complete pain, Dan. Best avoided. Throw another OT device like Evo into the pot and there are way too many variables. If the installer specified this system he is a plonker, no wonder he isn't coming back. Anyone considering something 'clever', read this and learn...

Opentherm can be a nightmare, I refuse to use it. Viessmann 1B1B open vent, I assume? Viessmann's internal logic can be a PIA and can end up modulating boiler down as you describe. With the addition of OT I'm not surprised the thing has a mind of its own. Sometimes less is more. Personally...

Check them out; https://beta.companieshouse.gov.uk/company/05838877

Filling loop on a Worcester is a push button; they've gone from the most difficult to the easiest. If you want a boiler that will be supported for years by a manufacturer who cares and has 320 engineers and a huge call centre open 7 days get a Worcester Bosch. If you want a boiler that most...

Moles for one

As Tony says - ignoring the pricing, as usual - if you fit a Worcester to a ****ey system you are going to be back in the poo in around 2 years. A chemical flush won't do., on a dirty system only a Powerflush, correctly done a rad at a time has any hope. Preferably with a Magnacleanse in...

It expires every 5 years now. So you are out of scope, ha ha

Yes, and no. Shall I guess the boiler make and model now?

The second option would be best but better still is to locate the BDR where the wire to the current thermostat originates, rather than on the wall where the old thermostat was.

OFTEC. And it's not a legal requirement in the UK either. Only gas appliances have a legal status regarding who can work on them and who can't.

Entitled to a free boiler? Do tell.