Hot water and UFH heating system recommendations

[Brix]

Hello,

 

My home is currently run on two separate systems.

 

Granny flat with UFH run off Worcester combi.

Remainder of house UFH with Potterton Suprima 100 boiler and 240L Thermalstore with secondary hot water loop.

 

Planning to combine the two. 

6 bed 3 rec

2 shower rooms, plus

1 bath / shower room, plus

1 more shower planned.

 

Terribly insulated (ie, barely - it's listed) and detached.

 

Going to be run off gas but would like option to upgrade with G/ASHP or solar at a later date (listed building and just too tricky at the moment).

Will include electric immersions in case I can take advantage of Octopus night time rates / battery at a later date.

 

Looking for thoughts on what type of boiler / tank set up would be most appropriate to my circumstances.

 

Cheers!

[VapourSnow]

Hi Brix,

Have you done any heat loss calculations, such as a U-value calculation?

As I would suggest the starting point would be to work out the heat loss for the overall property.