Heat Pump Buffer Tank for Hydronic Heating and Cooling Systems

The Heat Pump Buffer Tank is designed to add thermal mass to hydronic heating and cooling systems, helping the heat source and terminal circuit operate more smoothly under changing load conditions.

By increasing the amount of water available in the system, the tank can absorb and release thermal energy as demand changes. This provides additional stability for systems using air source heat pumps, boilers and solar thermal equipment.

The series is available in capacities from 60L to 500L, providing options for different residential and commercial HVAC installations.

Keep Heat Pump Operation More Consistent

Heat pump systems can experience frequent cycling when the connected system has a relatively small water volume or rapidly changing heat demand.

The buffer tank provides additional system water volume, giving the heat source more thermal mass to work with.

This can help:

• Reduce frequent start-stop operation

• Improve heat pump operating stability

• Smooth fluctuations in supply water temperature

• Provide additional thermal storage

• Improve coordination between heat generation and heat distribution

The tank is particularly useful when system demand varies throughout the day.

A Useful Component Between Heat Source and Terminals

The buffer tank can be installed as part of a hydronic heating or cooling circuit, creating a thermal link between the heat source and distribution system.

A typical system may include:

Heat Pump / Boiler / Solar → Buffer Tank → Underfloor Heating / Fan Coil / Other Hydronic Terminals

This configuration allows the tank to provide additional water volume while helping balance the different operating characteristics of the heat source and terminal side.

Suitable for Heating and Cooling Applications

Unlike a dedicated domestic hot water storage tank, this product is intended primarily for closed-loop or hydronic HVAC applications.

It can be used with:

• Air source heat pumps

• Boiler heating systems

• Solar thermal systems

• Underfloor heating

• Fan coil systems

• Hydronic heating circuits

• Hydronic cooling circuits

This makes it suitable for both new HVAC installations and system upgrades.

Multiple Material Configurations

Different projects may require different tank materials. The inner vessel is available in:

SUS304 Stainless Steel
A practical option for general HVAC applications.

SUS316L Stainless Steel
Suitable where enhanced corrosion resistance is required.

Duplex 2205 Stainless Steel
Provides an additional high-performance material option for demanding projects.

The outer casing can be supplied in painted galvanized steel or SUS304 stainless steel.

Insulated to Reduce Thermal Loss

The tank is equipped with HCFC-free foam insulation to help retain stored thermal energy.

Depending on the selected model, insulation is available in 45mm or 50mm thicknesses.

Good thermal insulation helps limit heat loss from the stored water and allows the buffer volume to perform its role more effectively within the HVAC system.

Connections for Different System Designs

The tank provides multiple connection configurations for integration into different hydronic systems.

Available circulating connection sizes include:

• G1"

• G5/4"

• G6/4"

• G2"

Additional connection points are provided for functions such as air removal, temperature sensing, drainage and safety protection.

The maximum working pressure is 8 bar.

Optional Auxiliary Heating

For applications where additional heating capacity is required, the tank can be configured with an optional electric heater.

Available options include:

• 1.5 kW

• 3 kW

• 4 kW

A thermostat can also be specified as an optional configuration for additional temperature control.

Applications

The Heat Pump Buffer Tank can be used in a wide range of hydronic HVAC projects, including:

• Residential heat pump systems

• Underfloor heating systems

• Fan coil heating and cooling

• Boiler-based heating

• Solar-assisted heating

• Commercial hydronic HVAC

• Mixed-source heating systems