which is best, Vokera, Potterton or Baxi duo tec

gerrynortheast · Nov 15, 2013

lame plumber said:
if your putting in any boiler esp a wb that has a plate heat exchanger, get it power flushed if the bbu is dead. Or fit an intergas and flush on completion as there isnt a lot to block!

Unfortunately I don’t understand what you mean as I’m not a plumber or heating engineer.

Plain English please.

Ermintrude · Nov 15, 2013

kyle87 said:
Vokera a are gay is the best and most technichalist term I've ever came across for describing a boiler lol

A lesbian boiler is ok, bi is to be avoided but gay it's just not right , not down here in Texas!

Kyle87 · Nov 15, 2013

gerrynortheast said:
Unfortunately I don’t understand what you mean as I’m not a plumber or heating engineer.

Plain English please.

Basically telling you to have system cleaned before installing boiler. As crud will block the plate heat exchanger in your boiler.

Your plumber needs to decide how to best clean your system ie power flush or mains flush but either way it needs to be cleaned.

Don't opt for the cheaper one based on cost as a dirty system will kill your boiler in no time

gerrynortheast · Nov 16, 2013

So can the system be power or chemical flushed without using a boiler since the old one that’s in is dead?

I asked the guy about flushing using the new boiler and have been told as follows..

I

t's fine and normal practice for heating engineers.

The water only passes through the heat exchanger in the boiler which is basically a pipe that gets hot to heat the water. There is not going to be any debris or dirt left in your system when I am finished to cause any problems anywhere.

Can anyone please tell me if this is correct info?

nipper39 · Nov 16, 2013

As far as I am aware some typs of clean is necessary under the manufacturers instructions. Power flushing is more to do with the litres per min been pumped round the system around about 100 per min along with the chemicals used it dislodges debris and because of the high flow pump it scoures the pipes with the debris and chemical solution. This is much better than a chemical been pushed round by a central heating pump. But first ask yourself a few questions , were the rads hot before were there any cold spots on rads , did system take ages to warm up . If rads were fine then it proberbly dosent need power flush. Another option on combi systems ir to put a drain point onreturn pipe as close to boiler as ppossible then you can shut off valves on boilers flow and return and usingmfilling loop flush the whole system as much as is necessary, first hot then cold , with a cleaner in if you want and repeat untill your happy

Kyle87 · Nov 16, 2013

gerrynortheast said:
So can the system be power or chemical flushed without using a boiler since the old one that’s in is dead?

I asked the guy about flushing using the new boiler and have been told as follows..

I

Can anyone please tell me if this is correct info?

It's correct about the heat exchanger being a pipe, but often it's a flattened pipe pressed into a large coil. But the bore remains small.

I wouldn't ever dream of putting dirty water through a new boiler.

Maybe others will say different but I doubt it.

I think we've killed this topic now. You've got all the advice. Take it or leave it but thanks for using ukpf 🙂