Is the Atmos Multi any good?

[rockinter]

Hi,
Got a house in which we have 4 showers, 12 radiators. We used to have combi sealed boiler in it, before the extra 2 showers were put in. We are now thinking will a combi be sufficient. Or do you think the Atmos Multi boiler will be any good as it has the storage tank built in?

thanks

 

[doitall]

The Atmos is without doubt the best Combi boiler on the market, the question is can the mains deliver.

 

[bengasman]

No combi will supply 4 showers adequately at the same time; you will need a cylinder for that and a big mains all the way back to the streetvalve, or coldwater storage with a big outlet.

 

[rockinter]

Will they supply 2 showers at the same time?
Also if i get a cylinder does it need to be vented or unvented?
And in order to fit a cylinder do i need to have system boiler or will a combi boiler do?

 

[doitall]

No combi will supply 4 showers adequately at the same time; you will need a cylinder for that and a big mains all the way back to the streetvalve, or coldwater storage with a big outlet.

I assumed the OP was fitting the Monosolar thermal store with the boiler Ben, in which case it will eat it.

 

[bengasman]

Will they supply 2 showers at the same time?

Yes, plenty of combi's will happily feed to showers; 35 kW and up will usually do the trick, always assuming the mains is adequate.

Also if i get a cylinder does it need to be vented or unvented?

Either. The difference is that unvented will need the supply to be able to deliver at least 40 l/min.

And in order to fit a cylinder do i need to have system boiler or will a combi boiler do?

Any boiler can be used to heat a cylinder.

 

[doitall]

25Ltrs/min will do all 4 if you just want normal showers.

http://www.atmos.uk.com/core_files/productDoc(204).pdf

 

[bengasman]

No combi will supply 4 showers adequately at the same time; you will need a cylinder for that and a big mains all the way back to the streetvalve, or coldwater storage with a big outlet.

I assumed the OP was fitting the Monosolar thermal store with the boiler Ben, in which case it will eat it.

You could be right, I hadn't gone that far. I read a combi as a "normal" combi. I doubt if the existing mains will be able to push 4 showers though.

It's amazing how many people never give that a second thought. A builder friend of mine asked me to quote on installing a new combi for a house with 1 bathroom and 3 ensuites a couple of years ago. The place had a 15 mm mains.

 

[doitall]

You should look at the Atmos closely Ben, Brilliant design in it's simplicity.

If you want any manual just shout. Although most are online now at www.atmos.uk.com

 

[bengasman]

25Ltrs/min will do all 4 if you just want normal showers.

How does that work on 6 l/min? Are you thinking about those water/eco friendly showerheads?

 

[doitall]

Click on the link and read the spec.

You can get a good shower at 6-8 Ltrs/min.

Remember it chucks out 40c plus

 

[bengasman]

You should look at the Atmos closely Ben, Brilliant design in it's simplicity.

I like simple, I am used to it.
Have to admit I am a bit skeptical about those brilliant solutions until I have seen them work.
All jokes aside, it was the complete, yet simple setup that impressed me about the new Viessmann 100 when I saw it recently.
I will do some research into atmos; it will have to wait until silly season is over though.

 

[bengasman]

Click on the link and read the spec.

You can get a good shower at 6-8 Ltrs/min.

Remember it chucks out 40c plus

Thought you meant 25 in total, not just hot. Would need a fairly impressive mains I reckon. Not my specialty; not a lot of houses in London with 4 showers/bathrooms.

 

[rockinter]

Am i correct in thinking that the cylinder needs to be constantly on. Therefore there will be a lot of waste heating of water like throughout the night as the cylinder keeps the water on?

 

[doitall]

As there is very little heat loss, you could be talking a couple of minutes.