ASHP temperature settings query.

[Marvin]

Can someone clarify this for me please.

 

ASHP involved: Cool Energy CE-iVT9

Set up: Buffer tank to radiators. 205L hot water tank. Carel PGD1000F00.

 

Question:

 

Relating to heating only (for clarity) : Does the temperature of the water heated by the ASHP change as the temperature set point of the buffer tank changes (example A) or does the output temperature of the ASHP stay the same but only heat the buffer tank up to the set point (example B)?

 

Example A: ASHP heats water to 5 degrees above the Buffer tank set point and heats the Buffer tank until it reaches the set point.

 

Example B: ASHP heats water to 50 degrees and heats the Buffer tank until it reaches the set point.

 

[JohnMo]

Really depends how it's setup. Would think every parameter you mentioned can be adjusted.

 

But neither way mentioned sounds an efficient way to run a heat pump.

[Marvin]

2 hours ago, JohnMo said:

Really depends how it's setup. Would think every parameter you mentioned can be adjusted.

 

But neither way mentioned sounds an efficient way to run a heat pump.

I didn't say I use weather compensation so auto stepped temperature targets.

[dpmiller]

ASHP output will rise as the buffer heats, the system attempts to keep a constant DeltaT

[Marvin]

On 27/12/2025 at 21:40, dpmiller said:

ASHP output will rise as the buffer heats, the system attempts to keep a constant DeltaT

Thanks for that.