Any plumbers on here?

The main thing you will get is an increased flow rate with the Megaflo, or unvented system, giving you a better shower etc.

Yeah, obviously that is a terribly inaccurate way of testing the mains, this will need to be done properly.

[BoltonSte]

just thought I'd hijack this one if you don't mind?

My radiators have a temperature gradient of hot at the top to cool st the bottom, anyone know what's up?

Runs off a combi I'm guessing installed in 98 (radiators could be older) I've bled them when cold but it's made no difference, what's the cheap remedy? As I will be getting a new boiler at somepoint and may redo the radiators as well for more bling.

cheers

Ste

[dirtydog]

Generally if your rads are cold at the bottom means you probably have a build up of sludge in them. As for a cheap remedy you could drain the system down, take each rad outside and shove a hose pipe in one end and run water through them. It may or may not work.
If you're going to get a new boiler in the not too distant future then just wait till then and replace the rads at the same time. If you're not going to replace the rads and pipes then you'll need to get the system powerflushed before fittin gthe new boiler anyway. Power flushing will set you back about a few hundred quid at least, i think british gas charge about ?600. the problem with that is if you powerflush an old system it may spring leaks all over the place and have to replace the rads anyway

[BoltonSte]

Yeah I had a feeling it would be something like that, do any of the anti sludge chemicals that you can buy work or are they really just as a preventitive?

It'll probably be another year or two before I get round to changing the boiler.

Ste

[dirtydog]

Originally Posted by svste

Yeah I had a feeling it would be something like that, do any of the anti sludge chemicals that you can buy work or are they really just as a preventitive?

It'll probably be another year or two before I get round to changing the boiler.

Ste

The anti sludge chemicals you get are only really preventatives, they're corrosion inhibiters.

You can buy system cleaners but how effective they are i don't know, it will depend on the level of sludge in your system

Aye, sludge in your rads.

You can buy 'de-sludgers' and whatnot, you'll need to put them in, leave for a while, then drain down, then re-fill with inhibitor.

If you are getting a boiler replaced on an old system they should powerflush the system anyway.