Combi boilers and heating systems

[JAD]

I hope this isn't a daft question?
I am thinking of upgrading my old open vented heating system with a combi boiler. Can anybody tell me if draining this type of sealed heating system is just as straight forward as it is with a traditional system (for adding radiators, cleaning out the system, etc) Any information would be greatly received. Thanks in advance.

 

[ACOperson]

Itsmore straightforward really, as theres no ball valves to get stuck, and the cold feed is less likely to become blocked as a result of water in the system being open to the air for 20 years.

Sealed systems rule!!!!

 

[JAD]

Thanks for that.
Do you know of a site that explains the process of draining a sealed sysytem?

 

[ACOperson]

Theres no skill to it really, its much easier than draining an open vented system. You simply attach a hose to a drain off cock if there is one, and open it. Providing that there is no new water being introduced to the system (ie make sure the filling loop is not open), the water will drain out.

When you want to fill up, just close the drain off and open the filling loop tap. Ensure the air is venting from the auto aor vent if there is one, hey presto!

 

[JAD]

Thanks for that. I'm a bit of a 'tinkerer' and would like to be able to move radiators about and such. I'm gradually coming round to liking the idea of a combi, especially as I want to have a radiator in the loft conversion which is presently above the header tank.

 

[Agile]

Its just possible that your existing boiler could be used on a sealed system.

You will need to read the manufacturers instructions or consult them.

You do not have to get a combi. You could get a new heat only system boiler to use with your hot water cylinder ( or a newer replacement ).

Carefully consider the pros and cons of a combi. A combi can take up to 20 minutes to fill a bath for example.

Tony

 

[JAD]

Thanks again for sound advice.
I need to replace my current boiler so I am weighing up all the options.
I keep hearing mixed reports about combi's. (some people love'm and others despise them). My reckoning is that if I get a top-notch one that is more powerful than I really need (plus a service contract!), I should be ok.
We don't bath(e) too often either