Gas Boiler: Combi v System

Bateman

Did some cursory searches both online and on here, but just looking for clarification, hopefully I am not asking something that’s been asked a ton of times before:
http://www.pdplumbingsupplies.com/blog/the-difference-between-a-regular-boiler-a-system-boiler-and-a-combi-boiler/

The above says: “A system boiler heats water directly from the mains (like a combi boiler - see below)”

Does this simply mean in the same manner, ie it heats it through the mains, or does it means that it heats it through the mains, and furthermore is immediate/available on demand? I’m guessing system boiler doesn’t provide on-demand as otherwise there wouldn’t be much of a difference/any difference between the 2.

I am installing a system boiler as I have a hot press & cylinder, am not stuck for space so don’t need to remove it, and have electric showers upstairs and downstairs. Now in the future we may end up getting an overhead shower upstairs that works off the cylinder, but I still don’t see the urgent need to upgrade to combi. The other half disagrees and believes that having a combi future-proofs us more.

K.Flyer

A combi boiler is installed when there no hot water cylinder. It takes a high pressure water feed and heats water on demand for taps and showers etc
A system boiler, as you have, requires a cylinder to provide the demand for hot water.
If you have no issue with space and your hot water requirements are met, there should be no need to consider a combi boiler.

rolion

You can have a combi boiler as a a system boiler ... but not the other way around !
I'll go with a combi.