ASHP / Thermal Store / hot water and UFH to external pods

[Jenki]

I'm in the planning stages of a small croft house 86SqM, and initially 2 self contained glamping pods, possibly more in the future.

The site is in the Highlands near the East coast. 

I have an Idea and would appreciate any thoughts.

I'm thinking of installing an ASHP in the main house, and a vented thermal store with solar coil. (Vented so I can plumb myself) and UFH with passive type slab

All straight forward, but then  I'm thinking of trying the heat  UFH of the pods and supply the hot water  as well.

Outline plan pods will be 30 and 40 meters away. Can be changed.

Lay pipes 22mm hot X2 and flow and return with insulation about 1m maybe deeper in the ground. T into 1 pod then onto the 2nd.

 

Firstly due to lengths I'm thinking of recirculating the Hot water (hense 2xHot) so a concern is that this just drains the heat from the tank, If the temp drop of the returning hot is too great.

 

Any ideas suggestions / thoughts / criticisms more than welcome.

Regards Pete