Any plumbers on here?

I have a question regarding Combination Boilers & Mega-Flow systems

Let me know and I will go into more detail

Cheers

there's a few plumbs on here.

hth

[dirtydog]

Yeah go on then, what's up?

We are in the process of having a loft conversion, we were going to have a mega-flow system installed but the original plumber has personal issues and cannot do the work, so the builders found another plumber. He came around on Tuesday to price up the job but said that the mega-flow would not give us any benefit over a combi. At present we have a traditional boiler / expansion system with a hot water cylinder in the airing cupboard.

My very limited understanding of a mega-flow is that you get better pressure and have more scope when two or more things are using the water, for example a bath running with the shower on at the same time.

So I just need to know if he is talking cr*p for some reason.


Cheers

[dirtydog]

Basically a mega-flow system is an unvented hot water system. Using one will give you better hot water pressure at the outlets as the cylinder is pressurised but it will depend on the water pressure coming into the cylinder. Whereas a normal cylinder works under atmospheric pressure. Are you looking at getting a combi boiler and the megaflow or a conventional boiler and megaflow?

Conventional boiler, keeping what we have, and the megaflow to replace the header & immersion tanks.

The plumber started by saying that we have quite a high mains pressure, but he only held his thumb over a tap, telling me he could generally hold about 1.5 bar but could not hold ours. We are very confused as we are looking at spending about 3k on this and obviously want the correct system.

[dirtydog]

pm'd

Be careful....if you are only upgrading the boiler and leaving in the original rads and pipe work...you may have issues. The higher pressures involved with a combi boiler may cause leaks, or in extreme circumstances, might cause radiators to burst. Sometimes they have rusted through on the inside. Find out what the safety valve is rated at on your new boiler and have your system pressure tested to at least that.

I am going to go for the mega-flow as it works out the same cost as replacing my current boiler with a Combi.
In regards to the pressure, should the plumber not testt his as a matter of course?

Cheers

[dirtydog]

Originally Posted by ukgooner

In regards to the pressure, should the plumber not testt his as a matter of course?

Cheers

Well you would presume so