Install of a largish MyEnergi Libbi battery

[Krill]

Lower inertia in terms of heating up the heat transfer agent ie the water because there is less of it. The ASHP needs to use less energy to heat up the entirety of the water in the system, to X degrees c to create the temperature differential that then heats each room. The downside is that when the AHSP switches off, there is far less energy in the system so it stops warming the radiators/floor quicker than the system with greater water content.

So faster to heat, uses less energy, but quicker to cool.

[Stinsy]

Lower inertia in terms of heating up the heat transfer agent ie the water because there is less of it. The ASHP needs to use less energy to heat up the entirety of the water in the system, to X degrees c to create the temperature differential that then heats each room. The downside is that when the AHSP switches off, there is far less energy in the system so it stops warming the radiators/floor quicker than the system with greater water content.

So faster to heat, uses less energy, but quicker to cool.

Who told you that?

[Tinbum]

Lower inertia in terms of heating up the heat transfer agent ie the water because there is less of it. The ASHP needs to use less energy to heat up the entirety of the water in the system, to X degrees c to create the temperature differential that then heats each room. The downside is that when the AHSP switches off, there is far less energy in the system so it stops warming the radiators/floor quicker than the system with greater water content.

So faster to heat, uses less energy, but quicker to cool.

The principle makes sense to me, but its not energy saving at all, in fact probably the opposite as cycling often isn't good. Also normally you would not cycle an ASHP so isn't really logical/applicable for the use.

[nowty]

Its a very well known fact that you need oversized radiators for heatpumps to work efficiently. The lower the temperature of the water the more efficient the heat pump is (higher COP value), therefore the less energy you use for a particular house thermostat setting. For the house to warm up to your desired house temp with lower water temps you need larger surface areas.

https://www.isoenergy.co.uk/latest-news ... -heat-pump

[Stinsy]

Lower inertia in terms of heating up the heat transfer agent ie the water because there is less of it. The ASHP needs to use less energy to heat up the entirety of the water in the system, to X degrees c to create the temperature differential that then heats each room. The downside is that when the AHSP switches off, there is far less energy in the system so it stops warming the radiators/floor quicker than the system with greater water content.

So faster to heat, uses less energy, but quicker to cool.

The principle makes sense to me, but its not energy saving at all, in fact probably the opposite as cycling often isn't good. Also normally you would not cycle an ASHP so isn't really logical/applicable for the use.

It is complete nonsense!

You want as much water volume as possible. Rads designed specifically for heat pumps have a HUGE water volume.

Low-volume rads and a heat pump is a disaster for efficiency and will dramatically shorten the life of the heat pump!

[Tinbum]

It is complete nonsense!

II wouldn't quite go that far as the physics is correct it's just complete nonsense in the application it's been suggested.

[Stinsy]

It is complete nonsense!

II wouldn't quite go that far as the physics is correct it's just complete nonsense in the application it's been suggested.

The logic is completely misguided though.

Small rads have been fitted with the aim of a more-responsive heating system. While this would work with a gas boiler it'd be woefully inefficient. With a heat pump it won't work at all and will damage the heat pump!

[Yuff]

The radiators are specially designed to work with heat pumps, hot and cold flow, and have a heat exchanger and hybrid fan within the radiator casing.
They also have less water content which helps the flow around the heating system.

[Stinsy]

They also have less water content which helps the flow around the heating system.

That doesn't make sense! More water the better.

[Tinbum]

The radiators are specially designed to work with heat pumps, hot and cold flow, and have a heat exchanger and hybrid fan within the radiator casing.
They also have less water content which helps the flow around the heating system.

Can you link to spec /website.