Replacing a system boiler with a combi boiler

[Gemma]

First time using the forum so apologies if this isn't in the right place.

We're planning on fitting an en suite shower room in the space where we currently have built in wardrobes and a hot water tank. Just at the thinking stage at the moment. Since there is nowhere else to move the tank to, I am assuming replacing our (10 year old, vaillant ecotec) system boiler with a combi boiler is the obvious option? We haven't had any issues with the boiler, but we do run out of hot water if a few of us have a shower one after the other. We also have a spray kitchen tap that is supposedly suited to gravity fed systems but is very sluggish. I'm hoping a combi would fix both these issues..? (We shouldn't have a need to run 2 showers at the same time, the en suite is more to gain an extra toilet / someone use the shower while someone else is in the bath). Finally, we have a power shower over the bath at the moment, I know this will need to be replaced but I'd like to have the same powerful flow as we currently get, will this depend on what shower we get? On our mains pressure? Sorry if I sound a bit clueless!

 

[Rob Foster]

Combi’s suck basically. No one would really want one except
When they need to save space
Have a small gaff with one bathroom
Choose an installer who won’t or can’t fit a system or conventional set up
Combis are also cheap.
They are and always will be a compromise
Ok some in here will disagree but that’s what I think.
Rob Foster aka centralheatking

 

[Riley]

I agree. I feel it’s always a compromise on performance

 

[Welder]

Just one more addition to the UVC camp.

No matter what combi you have, ALL quote a flow rate based on a temp uplift of 35 degrees. That means with a shower needing to be 43 the flow rate immediately drops. Then for 6 months of the year water temp entering the prop drops so its even less.

Combis are sh1te for showers unless stupidly oversized but then it causes prob by cycling on htg...