Heat Pump Design

Buffer Vessel Sizing Tool

Determine if you need a buffer vessel, what size, and which hydraulic schematic to use — based on your ASHP model, heat loss, and system volume.

Heat Loss (kW)

Design Outside Temp (°C)

Design Room Temp (°C)

Target Flow Temp (°C) Range: 35-55°C

Unit Model (kW)

Emitter Type

System Volume (L) Estimate: ~10L per kW of system + radiator volume

Glycol Used?

Mild Check Temp (°C) For cycling assessment at partial load

Max Acceptable Cycles/Hour Typical: 4-8 cycles/hr for good modulation