we have a reasonably well functioning gravity (open vent) system. The only problem is that one of us likes long showers so ideally would like more pressure and definitely more hot water.
We were advised to go for sealed system with larger hot water cylinder or for a combi. But we also were told that to be safe, need to replace all pipes.
As an alternative, we are thinking about getting a bigger hot water cylinder (from 117l to at least 160l, ideally 200l) and installing a pump for shower.
1. What would you do if you were us?
2. Is the sealed system worthy of the hassle of replacing the pipes?
3. How high is the chance that we will need to replace pipes (our flat got converted in the 1980s but we do not know much about the pipework)?
4. Is upgrading the hot water cylinder alone sufficient or do we also need to upgrade the cold water tank as well?
We have two baths/showers which would be good to run simultaneously, but this is not necessary. Our bolier is condensing, and we do not mind upgrading it if needed.
Huge thanks in advance