I want to swap the heat exchanger on my boiler with a new one as it has got clogged (probably rust from the rads) How easy is this and what are the steps I must take?

Also thinking of adding a magna clean filter...what should I know?

do you mean the plate heat exchanger or the main heat exchanger?

The plate exchanger. thanks

Very easy on these, but get 4 new 'o' rings to fit when you put the new one back on.

The hardest part is finding somewhere to drain the boiler. I usually take a new PRV with me so I can use the PRV to drain it (Not recommeneded though) and then if the PRV drips I have it covered with the new one.

_________________
Dave

www.drlgas.co.uk

So I need to drain the boiler? I assume the exchanger goes out through the bottom- What else please?

I only give general help. Not a step by step guide on how to do a job. For that you need to call my £10/min helpline

_________________
Dave

www.drlgas.co.uk

as gas 4 you has stated get hold of the plate heat exchanger o-rings as it will forever leak if you dont

1 cold mains supply off to boiler/turn boiler off
2 open hot tap till it stops
3 drain pressure out of system/get as much water out of you boiler as possible
4 cover any electrical components in cloth or paper towel
5 take the plate HE out with a bucket/drain down tray under the boiler just incase
6 remove old orings(x4) from HE or manifold and replace with new ones with a bit of silicon grease on them
7 insert new/cleaned HE back in possition
8 turn cold mains back on to boiler tap should run with no leak
9 turn tap off should be no leaks at standing pressure
10 fill system back up with no leaks
11 do not pass go do not collect 200

hope this helps

I would isolate the boiler from the system and only drain the boiler.

That greatly reduces the time taken to get rid of air in the system.

Thats important when doing a repair at a fixed price.

Tony

This is helpful as there are no visible drains on any of my rads or a system drain outside the property ( I think it goes to a void under the floor!)

Also the closed imput loop is left in place- as it has been by several engineers- is this legal? does it matter much?

Until the isolating valves leak when you touch them, as most will after a few years.

_________________
Dave

www.drlgas.co.uk

it goes against the water regs but with 2 none return valves on it there is no way its passing back in to potable/holesome water

Hi

Am am new to the forum and not a plumber by trade.

Thanks to the forum I now have working hot water again, so I am just saying thank you!

I also removed the pipe which connects flow and return, just underneath the secondary exchanger, and removed some GUNK from that.

Thanks again