Pressurising hot water in house

thewiseowl12

Grateful for any advice on the following and thanks for your time.

I wish to pressurise the hot water system in my house to feed 3 showers, kitchen sink and bathroom taps, as part of a potential retrofit. For context, I will need to replace my gas boiler as well.

My understanding is that I either:

(1) Get a pump connected to the cold water tank, get a new unvented hot water cylinder and do it that way to have pressurised hot and cold water. Buy system boiler

(2) Retrofit a pump to my current unvented hot water cylinder set up. Buy system boiler

(3) Install something like a Viessmann 111 Storage Combi Boiler, which says it can supply 2 bathrooms. Will also need a pump. Maybe put an electric shower in one of the bathrooms.

I'm imagining (2) is the cheapest install - using a stuart turner pump that pressurises the hot and cold to the same pressure? The benefits of (1) and (2) are that I can also add solar panels with a diverter, or use cheap night rate electricity to heat the water (currently 5c 2-5am).

(3) has the benefit of no need for a hot water tank and no hot water wastage, albeit the system is probably not designed for a 3 bathroom house. I have experienced a combi before where there is a noticeable temp drop when the kitchen hot water tap is used. That said, there is no benefit to solar panels really, and I'm presuming we will all have to move to heat pumps in the near future

Thoughts welcome, or any guidance appreciated.

whizbang

Definitly fit one electric shower. this allows for when theres no stored hot water. happens more often than you think. Ideally one shower could operate on Gravity feed also, leaving one pressurised. (but you have to charge the kids for this one!)

The 2 bathroom limit is simultaneous i think ? -You can have as many bathrooms as you like, just not all in use at once.