New heating system for old six-bedroomed house

[microtorque]

We have a large old stone-built house, heating is by a thirty year old Ideal Concord 2A boiler which runs twenty-two radiators, two bathrooms (shower in each, no baths) and heats a pool in the summer.

We are pulling the house apart for other renovation work so intend to replace the entire heating/plumbing system at this time. A recommended local plumber has proposed fitting a pair of large combination boilers, one each end of the house, each powering half the radiators and a bathroom - he appears an entirely sensible chap, I've inspected examples of his work locally and it is well executed.

I had already read up on using a pair of (non-combination) boilers which seems like a good idea, but haven't come across using a pair of combis (although effectively they would be working as two systems). We want zone controls for upstairs/downstairs and a third to allow the pool heating to be separately controlled for time/temperature.

An alternative would be to install a pair of conventional boilers and an unvented system with pressurised hot water tank - we have two teenage boys, so the bathrooms are busy in the momings, we need two good showers to be able to run simultaneously.

I would be grateful for any comments/questions/suggestions before giving our man the go-ahead.

 

[bengasman]

2 combis, each heating "one zone" and supplying one bathroom would be a lot simpler than linking 2 boilers, zoning it off, and installing a big cylinder to be able to feed the 2 bathrooms. Separate boilers will also give you more flexibility in control options.
Bear in mind that you will need to make sure your incoming mains is at least 32 mm up to the split to the 2 boilers.

 

[doitall]

That must be the craziest idea ever

 

[Tipper]

2 combis, each heating "one zone" and supplying one bathroom would be a lot simpler than linking 2 boilers, zoning it off, and installing a big cylinder to be able to feed the 2 bathrooms. Separate boilers will also give you more flexibility in control options.
Bear in mind that you will need to make sure your incoming mains is at least 32 mm up to the split to the 2 boilers.

And enough capacity in the incoming gas main and meter

 

[Deleted member 105431]

the rinnai twinflow is what you want, quality bit of kit. Also worth looking at is the glow worm ultrapower sxi 170.