Circulating pumps

[GSDog]

I'm looking at indirect un-vented hot water cylinders and noticed that all the pre-plumbed units available come with a circulating pump. I was under the impression that I would not require a separate circulating pump as the one in the system boiler should be sufficient?

The boiler I am looking at is a Worcester Greenstar 24I System Boiler.

Many thanks.
(This is for a 4 bedroom 2 bathroom house).

 

[Tibbot]

You'll need a non pre-plumbed model.

 

[muggles]

Don't go for a pre-plumbed one, waste of time and money, your installer will probably make a better job with a normal one