what boiler solution is best? Need a new boiler

[Aussiewantsaps2]

My Keston 80 has stopped working and we have been getting quotes and varied solutions, I want the convenience of Combi but 2 out of 3 plumbers have said that isn't powerful or good enough for my home plus that the water tank a heatrae sadia megaflo is so good it better to keep that and replace the boiler. I have a 4 bed home with 1 bathroom with mixer shower and 13 radiators, family of 4 often needing to shower at short notice, the current system can be frustrating waiting for the water to boost etc. What's your thoughts, The quotes so far seem eye watering and include a flush etc so what would people think?

 

[quality]

the last thing you want is a combi

 

[Aussiewantsaps2]

the last thing you want is a combi

Any thing to qualify that statement, was looking for reasons not just taking a poll

 

[Best]

Any thing to qualify that statement, was looking for reasons not just taking a poll ��

I only work on oil boilers, but the principle is the same, - for starters, combi boilers are more complicated and with much more to go wrong.
But the main issue is a combi will not have the flow rates a Megaflow or other unvented cylinder have. Unvented units have the large hot water storage and basically full flow of tap capacity, unlike a combi which is limited. Combis heat the water as you use it, - whereas your Megaflow has it in store.
You actually already have the highly desired best set up in place.
It is a pity you don't have a second bathroom with an electric shower (one that heats its water) so that you have both options and won't always depend on having the Megaflow fully heated.

 

[Best]

You can keep your Megaflow set up and get a combi, which could still heat the Megaflow on the heating side but also have its hot water output connected to just some hot supplies, but guess that won't suit you as you have only one bathroom.

 

[Gasmk1]

if you do want a combi boiler look at the viessmann 111 it is a largeish storage combi that has an internal unvented storage tank that recharges as hot water is being used we have fitted 2 now and been very impressed.

 

[Scott_D]

What size is the mega flow?

 

[finchy01]

A Combi is great. However, unvented systems (your current one) gives you the same benefit of mains power from every outlet like a Combi, however, with a Combi only 1 thing can work at a time, I. E heating will switch off when using the shower and also you may find you get low or poor flow if someone opens anot her outlet or flushes a loo when showering. Also WHEN your new boiler breaks down you will have no heating OR hot water, with your current setup you just turn on your immersion heater and will still all be able to shower. My solution, replace the boiler with a normal condensing boiler and turn you hot water to 24 hours that way it'll always be hot. A flush is often a good idea when installing a new boiler if it hasn't been done for a while but your installer can also Carr out a quick test to check the current state of your heating system. Hope this all made sense and helps.