New Boiler advice - System or Combi?

[MichaelT]

I am currently in the middle of a complete rennovation of my house and need some advice on what kind of boiler to get.

The house will have 4 bathrooms in total. One on the ground floor (shower), two on the 1st floor (en suite has a shower and family bathroom has a bathtub and seperate shower), one in the loft (shower). In terms of radiators, there will around 8 on ground, 7 on 1st floor, and 3 in loft.

Around 4-5 people living in the property long time. Chances are 2 people will want to shower at the same time but this limited to one if needs be.

I have a feeling a system boiler with cylinder will be the way to go but could a combi suffice if we remove the 2 people showering factor?

Also for a system boiler, can be boiler and cylinder be in the same space or should they be seperate? If seperate, can they be on different floors?

If combi is ok, what kind of spec should I be going for?

Thanks in advance!

 

[fowlerboi]

A combi is good for 2 bathrooms and 4 people at an absoloute max. You need an unvented cylinder. Why don’t you speak to the plumber about system design as it will be much easier for him than it will be for us with the limited information available

 

[Gasmk1]

Viessman 111 would do it or go for 222 floor standing. Or just normal bo8ler and unvented

 

[ShaunCorbs]

Boiler and unvented for me

 

[Deleted member 120897]

Intergas eco rf 30 can be changed in settings to different boilers and wiring arrangement can be done should you want a combi with a cylinder. I wouldn’t be doing 4 bathrooms off just a combi though.

 

[gmartine]

A large storage combi could feed more than two showers if you have requisite water and gas supplies, a large unvented however you wish to charge it is just a whole lot less stressful and I suspect more efficient.


I'm sure John.g could work it out 😉 cost to heat a 250l cylinder (including standing losses) v four 60 litre showers via a combi at full power.