Water pressure and combi boiler query

[Shiv]

Hi

i was wondering if you guys can help....currently I have a 3 bar water pumped fitted and from what I've been told I also have a combi boiler....I think I remember hearing from someone a while back that you can't have a water pump if you get a combi boiler installed...is this correct?

Before I got the pump fitted the pressure was crap....I really don't want lose the good pressure but still want to have constant hot water at the same time....is there a way round this that will allow this to happen?

thanks

 

[PlumbBobBob]

is the pump to boost the mains pressure?

 

[Riley]

Can't boost mains to any more than 12 lpm

 

[Shiv]

is the pump to boost the mains pressure?

I'm not sure I know...my knowledge on these kind of things is rubbish...il see if can upload some pics of the pump and the pipes it is connected to...but as far as I know the pump is not boosting the power of the cold main supply all the other pipes it seems to be boosting the power

 

[Riley]

Do you have tanks in your loft then?

 

[Shiv]

Do you have tanks in your loft then?

No I don't have a loft. But I have got a tank like the one in picture except mines a round tank not rectangle in shape.

 

[Riley]

No pic mate. Right I'm gonna take a stab and say you might have a combination cylinder/fortic cylinder. For some reason I can't post pics either at the mo does it look anything like this http://www.heatandplumb.com/acatalo...f_MsNXkflLZpx6DRLmu4LYzp7cdKD7DCeEBoC46Dw_wcB

 

[Riley]

So do you have an airing cupboard with a hot water cylinder

 

[jtsplumbing]

How meny pipes coming off your pump ? if only 2 all its pumping is hot water to shower and maybe taps, if you have 4 pipes then it is only feeding shower, What is your cold water pressure like ?

 

[Shiv]

Thanks for your reply. I've had a look the link but I think my set up is different. I've take pics of mine now so hopefully you guys will be able to tell now.

 

[Shiv]

So do you have an airing cupboard with a hot water cylinder

Yep i do

 

[Shiv]

How meny pipes coming off your pump ? if only 2 all its pumping is hot water to shower and maybe taps, if you have 4 pipes then it is only feeding shower, What is your cold water pressure like ?

Definitely 4 pipes. Cold water tap in the kitchen has Good pressure and and when I turn that tap on the water pump doesn't come on...only when I turn the bathroom taps on the pump comes on the hot water tap in the kitechen

 

[jtsplumbing]

Well you have NOT got a combi boiler, what they have done is to fit a twin pump to boost water to (from what you describe) all the hot taps, the cold taps in the bathroom, & sink unit will be on mains water, pump will then boost hot & cold to shower.

 

[Shiv]

Sorry my fault...I know I have not got a combi boiler I think mines a conventional boiler....what I wanted to know is if did ever get a combi boiler would the water pump have to be totally removed? I just don't want to the a combi boiler and sacrifice the excellent pressure I have already.

 

[jtsplumbing]

Yes pump would have to go, but everything would be on mains pressure

 

[Shiv]

Ok it's making sense to me now....at the moment my cold water tap in the kitchen has very good pressure and as far as I know it's not being powered by the pump because when I turn that tap on the pump stays quiet....so correct me if I'm wrong...if I did get a combi fitted and everything got moved to the mains, would my shower pressure be about the same pressure that my cold water tap is producein at the moment?

Sorry for such a long winded reply!

 

[jtsplumbing]

Simple answer yes, depends on combi output, other thing to consider would be a standard boiler with unvented cylinder, combi is ok but not for everyone.