ASHP Ducting

[Barnboy]

I didn't allow any ducting for an Air source pump into the house as I was advised when we were planning by the architect, electrician and electricity supplier that they wouldn't be suitable and I'd need an oil or electric boiler. 

A few years down the line now and still doing the conversion I'm thinking after reading everything on here that maybe I should be going down the ASHP route. 

I've got a 100mm and a 50mm duct that I could use if I only use my rainwater harvesting for the garden and not for the w/c and washing machine.

The run to where I could site the unit would be around about 12 to 14 metres with 2 swept 90⁰ bends including the one up through the slab.

Can anyone tell me if I could use these or am I dreaming and would need bigger ?

Thanks

[Barnboy]

I've searched about and have seen people saying, 28mm, 32mm pipes and 66mm insulation etc, which I know won't fir, I'm just hoping someone may have another option/solution. 

[nod]

The majority of plumbers and electricians have little or no knowledge of HPs Get someone down to give you a quote They will tell you your options 

[Russell griffiths]

Can you run it on the surface or in the ceiling joists

it all depends where your outside unit is going and your tank inside 

mines all surface mounted, but it runs through a garage and outside. 

[Barnboy]

I got our local electricity company who supply and fit ashp to come and have a look. They told me one wouldn't be suitable as they're only good for old drafty houses !

At a push I might be able to come in through an adjoining building and through the 1st floor posi joists and back down into my utility which is in the centre of the house.