Geothermal heat pump WGB 20 series

brine/waterpropane (R290)class A+++

Overview
The Weishaupt Geoblock® 20 brine/water heat pump recovers stored ground energy to provide heating or passive cooling. Designed as a closed-loop, outdoor-installed system to save indoor space; option to use natural refrigerant R290 (propane).

Operation & key points

• Uses ground-source geothermal energy via a closed brine/water system.
• Natural refrigerant R290 (propane) with a GWP of 3.
• Modulating operation: pumps and compressors adjust progressively to load.
• Modulation range: approximately 3.7–20.5 kW (B0/W35).
• Domestic hot water production possible; Weishaupt water heater range adapts to various requirements.
• Passive cooling station option available to temper buildings (additional components required; cannot be retrofitted without those components).
• Acoustic comfort: low-noise compressors and fans thanks to specific shapes and vibration dampers.

Product benefits

• High energy efficiency: from 1 kW of electricity, the Geoblock® 20 can deliver about 5 times more heating energy (excellent performance due to geothermal source).
• Supply temperature up to 70 °C, suitable for new builds and renovations; can feed radiators and meet high DHW hygiene requirements.
• Materials and design focused on efficiency and durability (aluminum, stainless steel, premium coatings, Sylomer vibration dampers).
• Complete solution: also supports domestic hot water production and integrates with multi-source systems (e.g., solar thermal).
• KEYMARK quality label and SG Ready compatibility (prepared for smart grid interaction).

Comparison table — models (excerpts)
Model | Heat pump type | Heating efficiency class LT | Heating efficiency class HT | Energy label range | SCOP (W35) | Width | Height | Length | Applications
WGB 20-A-MD-A | Brine/water | A+++ | A+++ | A+++ - D | 5.34 | 970.0 mm | 1,075.0 mm | 1,171.0 mm | Heating, DHW production
WGB 20-A-MDP-A | Brine/water | A+++ | A+++ | A+++ - D | 5.34 | 970.0 mm | 1,075.0 mm | 1,171.0 mm | Heating, DHW production
(Values measured according to DIN EN 14511)

Materials & quality

• Cabinet and internal components in aluminum and stainless steel with premium coatings.
• Sylomer vibration dampers for reduced noise and vibration.

Applications

• Heating for residential and tertiary buildings.
• Domestic hot water (DHW) production.
• Passive cooling capability for light building cooling.

Technical characteristics / specifications

• System type: brine/water heat pump (geothermal).
• Refrigerant: R290 (propane), natural refrigerant, GWP = 3.
• Modulating power range: ~3.7–20.5 kW (B0/W35).
• SCOP (W35): 5.34 (for models WGB 20-A-MD-A and WGB 20-A-MDP-A).
• Maximum supply temperature: up to 70 °C.
• Dimensions (WGB 20 series): width 970.0 mm; height 1,075.0 mm; length 1,171.0 mm.
• Applications: Heating, DHW production.
• Acoustic comfort: optimized compressors and fans, vibration dampers.
• Cooling function: optional passive cooling station (additional components required).
• Reference measurement standard: DIN EN 14511.