How to drain an EcoTec 28 combi boiler

[Claire]

I have a Valliant ecoTec Pro 28 combi boiler. Please could someone let me know how I drain the system to fit a new thermostat to one of the radiators.

I have looked on the boiler and cannot see a drain valve. The instruction manual says that it should be located 'on the lowest point of the system.' Could someone help?

Thanks.

 

[Plumbstar Tom]

has the boiler got isolators on the feed and return to the CH circuit?

If so flick them and it will create a vacuum

Then crack the nut on the rad and a few drips might pop out but thats in and away you go

if not you will need to drain via maybe one of the low drain cocks often next to a rad valve

 

[wheeto]

Are you sure it needs draining? Might just need a new TRV head? Or, if the valve itself, sometimes a knock is all that's needed to free.

Edit: Although I know this doesn't answer the question. Apologies if the OP has already thought this through....

 

[Toddyplumb]

Claire, do not do as Tom says unless you are confident and understand what he means and know what to do quickly if it goes wrong.
I think your best bet is to drain it down , if there is no drain then get one fitted.