Unvented cylinder in celler

[hoylez]

If I install an unvented cylinder in a cellar and a system boiler on the ground floor above will the system still work?

 

[Riley]

Why do you think it wouldn’t?

 

[hoylez]

Why do you think it wouldn’t?

No reason I've always installed on same floor or cylinder upstairs with boiler below

 

[steadyon]

1. There is no reason why it shouldn't work.
2. However, you will probably need to use an approved pump for the D2 pipe, unless you can access a drain at cellar level.

 

[SJB060685]

Of course it will work. The pumps on heating circuits are circulating pumps providing pressure to overcome system pressure loss and the required flow rates to maintain required heat emissions. Providing the system is properly designed it won't matter the position of the two, or the fact that one sub circuit is pumping downwards.
Steadyon raises a good point about the tundish discharge though, so take that it to your calculations.
Is this an installation you're undertaking yourself?

 

[SimonG]

If a pump is required for discharge it's an arm and a leg.