Unvented Cylinder advice please?

[Mark300zx]

Hi,

I am getting an unvented cylinder installed and have 2.3 bar of pressure entering the property just below the ground floor.

1. Would it be possible to place the cylinder in the loft, 7 metres above the ground floor, without a significant loss in performance?

2. What size tank would I need, it is a 4 bedroom property with one bathroom and two en suites and a potential of four adults living there?

 

[Mike2007]

Don't buy a megaflo, that's my advice.

 

[dcawkwell]

Yes you can put the unvented anywhere in the property.

 

[Mark300zx]

Thanks but would the drop in inlet pressure affect the pressure that the tank can deliver?

 

[TCCHeating]

7 metres is 0.7 bar. So it will turn your 2.3 into 1.6. Unvented cylinders can work well at 1.6 bar But there is more to it than that. What you need to be checking is your flow rate. Get your installer to do the relevant flow rate tests before you commit to unvented

 

[Mark300zx]

I presume the flow rate varies but is there a decent rule of thumb?

 

[dcawkwell]

The difference in pressure between loft and 1st floor would be maybe 0.25 bar. I don't think there would be a noticeable difference in pressure actually at the outlets

 

[Mark300zx]

Thanks I suppose I meant that since the intake is just below ground floor and the tank will be on the 2nd floor/loft would it adversely affect the pressure at the taps?

 

[simond]

Get an installer who knows his stuff. Big mistake doing the design on an internet forum. But the advice on Megaflo was good.