steveoelliott

That sounds exactly like what my Megaflo is doing right now!

Baxi delivered the boiler to me personally on a pallet Friday. I was also shocked by this! A manufacturer supplying an end customer with a product that they have refused to fund to fit, it's a little unseemly to say the least but I have no intention of fitting it myself. It's not second hand, has all paperwork with it and my (or indeed any plumber) can activate the 10 year guarantee once installed. My own plumber does a lot of work for builders and reckons he can sell it on my behalf. Of course it will be less than book price but be mutually beneficial.

If you can recall where, please let me know.

They did but I don't want another Megaflo with a floating baffle that will only break down again in time. They offered a Combi, with Flue and Controls which I plan to sell to fund the cylinder swap.

Thanks. My plumber has suggested Gledhill. Not sure of the difference. Appreciate you sharing that!

Understood and this advice has been resounding which has changed my mind. I intend to stick with a UVC.

Baffle broken down and very loud noise deduced to be internal to vessel. Now not going for Combi but considered it for a while.

Current one is defective.

Baxi, current one baffle broken down and loud noises coming from cylinder. Yes on a DIY group but not exactly the same question, rather about whether a Combi would be a suitable replacement.

I currently have a Megaflo system with the built in air gap. I've been offered a replacement or the alternative of a 36KW combi, controls and flue. The later is worth a significant sum of money even if I opt to replace the cylinder off my own back and then sell the boiler etc. The question is, what cylinder should I purchase. I hear a lot of folks slating the Heatre Sadia megaflo and it's systemic issues with the air gap breaking down etc. I've been told that Gledhill are better. Any thoughts?

So not performed any calculations yet and our current system boiler (Vailant Ecotec 637) is running fine. It doesn't appear to cycle frequently and with a crude estimate (double yours), it isn't too far off the mark. Probably don't need bigger for the CH and you are likely correct that larger would be wasteful. There isn't a problem per se. Water pressure does fluctuate between 2-3 bar at different times of day. I have a PRV with gauge on the incoming main. If we run the bath tap on full then other water outlets are majorly impacted but the same also applies for cold but not completely unusable. The reason for the consideration of swap is owing to an issue with the UVC which Baxi have agreed to swap with either another UVC or Combi Boiler under warranty. I then thought having a combi would mean one less thing to maintain, service or have the potential of leaking. It is however clear that a combi boiler is going to be a downgrade in our performance. I have no issues currently but fear I could going with a combi. I appreciate all the helpful advice and guidance folks have given.

That’s interesting, I need to look at calculations. We currently have a 37 kW system boiler running 21 radiators. I said 20 yesterday but I forgot one. Our house is around 2500 square feet.

Thanks all for your feedback. I wonder if a 40KW, 42KW or even a 50KW comes close. At Center Parcs they had a 50KW Worcester for the lodge and that did a decent job with two baths / showers.

To cut a very long story short, I’ve been offered by Baxi the choice of a replacement 210L UVC which is currently heated by our system boiler or alternatively a Baxi 36KW combi. Initially this was going to be a 40KW combi but the largest they manufacture now is 36KW. We have 20 radiators, 5 bedrooms, 1 bathroom, 1 ensuite and a downstairs toilet. Our water pressure is ~2 bar so that’s the biggest gating factor even with a cylinder. If the bath hot tap is on then hit to any other outlet is very slow. i had thought of going to a Combi as it’s one less thing to go wrong and be serviced annually. In addition, as our UVC is in the loft, it’s always worried me it leaking etc. I became concerned that swapping to a Combi may be an issue when I wa visiting my parents today who have a Worcester 30CDI combi. When running their bath tap, I was surprised at how much cooler their hot water is. Its of course very cold today 0C but I had expected it to be uncomfortable to leave my hand in the hot water. I suspect swapping the cylinder may be the best approach after all.

OK, so my plumber came today and for the first time I reproduced it with him in the loft next to the cylinder. I had him out to replace the NRV, T&P and EV. Figured I'd make sure everything had been done but after hearing the noise he told me it is definitely coming from inside the cylinder. On another group a plumber suggested that the breakup of the baffle can cause this noise as it catches / releases. Anyway, I've contacted Baxi to get a replacement.