New heating setup for flat renovation

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Hello all,

Very unoriginal topic – heating setup for a flat refurbishment. No doubt the builders I choose for the work will advise, but with a million things to think about I’d like to be as well-informed as I can be!

So I have an upper ground floor flat in a Victorian conversion that I’ll be completely renovating (ripping everything out). 3 bed 2 bath, 1 of the bathrooms will be moved so new plumbing will come in anyway. Existing setup is a Potterton system boiler and Range Tribune unvented cylinder. (If relevant, they’re quite far away from each at the moment, 5 or 6 metres apart, cylinder in the hallway cupboard, boiler in the kitchen). All working well, but given I’m renovating and they’re 15+ years old, makes sense to renew everything. Flow rate I get out of my kitchen tap and shower seems very good, so I guess water pressure isn’t an issue.

The flat is 130sqm, I’ll be doing (water) underfloor heating throughout. 3 bedrooms, 1 bathroom & 1 shower room. Living there by myself, but that’s kind of irrelevant as that’s unlikely to remain the case, either for me or for future buyers if I sell it, so don't want to limit myself.

So obvious choice would be to stay with an unvented system. From the research I’ve done, there isn’t a huge difference between main brands of cylinder. The OSO Super S seems to be generally highly regarded, neat and tidy, not outrageously expensive, so I’d probably go for the 180L version and a Worcester Bosch or Vaillant boiler.

However, there is a space issue. I can fit these in no problem, but they obviously take a decent amount of space which I could potentially use for other things. I’m trying to understand whether a larger combi like the floor-standing Worcestor Bosch Highflow could do, if not an equally good job, a very good job for my setup. It’s unlikely that 2 showers and the washing machine/dishwasher will be going at the same time, but would the Highflow be able to cope with 2 showers simultaneously with decent flow?

Any suggestions would be much appreciated!
 
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First, and most importantly, get the flow rate, static and dynamic pressures checked. If possible do this at times of peak demand and off-peak - important as you may have a shared supply as a result of the conversion.

Until you've established high/low pressures & flows everything else is guesswork.
 

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