Heating Setup

[Seadog]

So I am at the stage where I need to really sort out the house heating design. 

 

I have UFH upstairs and downstairs on separate manifolds, 3 towel rads and I can also make use of a PV array on the roof.

 

I have been pulling in various quotes for Thermal stores. I had it in my head to use a simple S plan system but one of the suppliers has recommended a twin coil thermal store with DHW/UFH. 

 

Any thoughts from those in the know would be very much appreciated.

 

thanks

 

Jas

[PeterW]

What is the heat source ..? Gas, oil or ASHP ..?

[Seadog]

Morning Peter,

 

I have mains gas on site. I have looked at ASHP but in the end have decided to go gas.

 

thanks

 

Jas

[PeterW]

Standard UVC and buffer for me here as three zone S plan and then let the UFH pull from the buffer, towel rads I would put on their own circuit/zone. 
 

Make sure both UFH manifolds have the proper blending valves and circulation pumps - 1 per manifold - and don’t be tempted to think one will do.  

UVC will give decent levels of hot water - how many bathrooms / showers..??

[Seadog]

Thank you 

 

we have 1 main bathroom, 2 en-suite, giving a total of 2 baths and 3 showers. 4 of us in total but we tend to all get showered etc at different times. 
 

Jas

[PeterW]

250 litre UVC would be fine unless you have space for a larger one..? Would be good as a PV dump so if you can accommodate a 300 or 400 litre UVC then it would be useful. How much floor space has UFH..?

[Seadog]

Thank you Peter,

 

UFH is 103m2 downstairs and 54m2 upstairs, total 146litres and 11kw to heat.

 

Yes I have room for a larger UVC.

 

Jas

[PeterW]

100 litre buffer and you will be fine there.

[Seadog]

Much appreciated.

 

So in summary, a 250l UVC with single coil for DHW, immersion (twin ?) with a 100l buffer.  3 zone S plan with the UFH off the buffer instead of the main hot feed. Use a room thermostat to control the towel rads ?

 

Thanks

 

Jas