Does anyone know about heat pumps? I have some questions (placement inside etc.)

[ImDoingThisNow]

As per the title.

100sq ft house (c). Installer reckons that one internal unit will be enough to heat the house (a couple of degrees cooler in the outer rooms).

He recommended a Panasonic, but I don’t know enough about them to compare to others.

It would be on a central internal wall rather than outside one to best heat everywhere.

There are so few websites that talk about anything other than the external unit…

We need more information. You can’t have an ASHP inside as it works off temperature differentials.
Is your house 100m2?
Did he give you a brochure or the heat pump model?

It's an air to air heat pump.

He gave a brochure but highlighted the one he would recommend.

I mean the inside unit. The air source pump unit would be outside and then there’s a connecting (fan?) unit inside. There are no radiators in the house. Last year, we survived using plug in heaters.

The outer unit would go outside on the back wall and the inner unit on an internal wall near the stairs - central to the house.

It’s basically an aircon unit then?
He’ll most likely run the pipes under the floor and up into the internal unit.
You’re better off trawling the internet, for running costs, noise, reliability etc.
Where will you get hot water from?

I don’t know about Panasonic’s air to air units but I have one of their air to water units and it’s excellent.

My brother’s house is heated by a Daikin A2A heat pump (replacing ancient storage heaters) and he needed two indoor units for a 110m2 bungalow. They since built a well-insulated 26m2 extension and the two indoor units are still enough for the whole house. Cost him just over £5k altogether. It would’ve been less but they had some challenges with length of pipe runs to overcome.

In terms of efficiency they got 4.8kWh of heat per kWh of electricity in Spring/Autumn which dropped to about 3.1 :1 when they were ankle deep in snow last winter. They are better suited to bungalows and ground floor flats where you can either easily access the loft for ducting or you just need one unit for the whole room (siting then outside an upstairs flat can be done but it will look like Mediterranean Europe where they all have their aircon on their balconies).