Megaflow Eco Slimline 170i boiler puzzler
Help and information on all topics relating to your central heating, air conditioning and ventilation issues.

2 posts   •   Page 1 of 1
Psimmo
Labourer
Labourer
Posts: 1
Joined: Sat Jul 29, 2023 5:42 pm

Megaflow Eco Slimline 170i boiler puzzler

Post by Psimmo » Sat Jul 29, 2023 6:26 pm

Staying in my daughter's flat and she said she had a problem with her boiler- leaking. Looks like it was just a leaky joint in the pipework just above the boiler, tightened it up looks ok at the mo.
In my research (I'm not a plumber) I noticed that this boiler is fitted with an internal expansion tank. However, there is also a large external expansion tank showing only 0.25 bar right next to the boiler and connected by pipework to it. Don't understand. Please advise. And do I need to recharge either or both of these expansion tanks as a result of the leak.
I can see no other discernable need for the external expansion tank as there is no other form of heating on this modern flat.

stoneyboy
Project Manager
Project Manager
Posts: 6397
Joined: Wed Dec 10, 2008 6:44 pm

Re: Megaflow Eco Slimline 170i boiler puzzler

Post by stoneyboy » Sun Jul 30, 2023 8:48 pm

Hi psimmo,
Yes you must top up the pressure in the system it needs to be 1-2 bar — look at the pressure gauge it should show the maximum.
The problem with expansion vessels inside the boiler casing is that - in theory at least - if it fails a Gassafe plumber is needed. It’s more economic to fit an external pressure vessel which can be bigger than the boiler one.
Regards S

2 posts   •   Page 1 of 1