Up grading central heating.

Briany3

I have a Baxi Bermuda boiler 15kw (working OK). With manifolds up stairs, and down stairs, and it has 10mm pipes. I am thinking of upgrading to a new more efficient regular wall boiler. My question is will a 18kw new boiler be compatible with the manifolds and 10mm pipes. The house is about 120sqm. Built in 54.
I would be obliged for any advice. Thank you.

roy rodgers

A 12-14kw HE boiler would probably do the job but put some sort of magnet cleaner on the system to protect the boiler from sludge, I wouldn't flush a 10mm system out with a power flusher as it could cause more problems down the line..

JohnnieK

I have powerflushed a few microbore systems and it improved them immensely. A couple of older valves started leaking but this can be expected even on a normal large bore system. I put in x400 two weeks before and then flushed with x800 on the day. a modern 18kw boiler would be self modulating so would only use what the system needs, it would still be best practice to size the boiler according to the heat load.

roy rodgers

@johnniek

That's interesting about flushing a micro bore system I was always taught that it was one system and an old g.b over 20 year's old that should not be flushed as it would cause either a blockage or leaks..

I even had a lad come into us in fas from magna clean to show us the product and he was even saying that never flush a micro-bore system!! but hey, he was there to sell a product:D If he had his way we wouldn't be flushing any systems!!!

note to one self, don't believe everything that your told in fas!!!

roy rodgers

roy rodgers wrote: »

note to one self, don't believe everything that your told in fas!!!

I don't trust nobody:D

JohnnieK

roy rodgers wrote: »

@johnniek

That's interesting about flushing a micro bore system I was always taught that it was one system and an old g.b over 20 year's old that should not be flushed as it would cause either a blockage or leaks..

I even had a lad come into us in fas from magna clean to show us the product and he was even saying that never flush a micro-bore system!! but hey, he was there to sell a product:D If he had his way we wouldn't be flushing any systems!!!

note to one self, don't believe everything that your told in fas!!!

When I say a few I mean just that 3 jobs in Rathfarnham, so maybe I was lucky:D. I had no issues except for a couple of rad valves but I kind of new that some would go so just replaced the leaking ones before fill up.

JohnnieK

gary71 wrote: »

I don't trust nobody:D

Not even me:D:D:D:D

JohnnieK

JohnnieK wrote: »

Not even me:D:D:D:D

Some questions should never be asked or answered

Briany3

Thank you all very much.:)

Micky Dolenz

I too have power flushed a load of micro bore systems. It worked out ok but while it improved it, it still wasn't overly great. I can only hazard a guess as to why. Micro bore systems are a bad idea or the system was poorly installed, probably a bit of both.

Oh and take with a pinch of salt what sales reps say.

Briany3

Well folks thank you very much. I got a KLW BAXI SOLO, power flushed, 2 zones by hand valves. Cost E2100 with plumper

I put 2 new rads, and 8 TRV,s myself E550. 10mm pipe not easy to work with.

Briany3

Sorry ment to be 18 KLW

Briany3

Well folks thank you all very much. The job is finished. I put in 18kw solo Baxi. So everything is going well. I put in 9 TRVs they are woking great. I don't know myself with the better heathing.

Briany3