Buffer storage tank WGJ-BE 800/1000 without WT

Product overview

The WGJ-BE buffer storage tank for heating water is a robust heat storage container for central heating systems, solar thermal systems, and heat pumps. It collects and stores excess heat, compensates for fluctuations in output, and improves the efficiency of the heating system.

Available in two versions (WGJ-BE 800 and WGJ-BE 1000), the Buffer storage for larger heating circuits and offers a durable, easy-to-integrate solution for heating installations.

Technical data

WGJ-BE 800: Storage volume approx. 710 l, standby losses approx. 62 W, ​​weight ~143 kg. WGJ-BE 1000: Storage volume approx. 830 l, standby losses approx. 71 W, weight ~160 kg. Maximum operating pressure: 0.3 MPa; Maximum operating temperature: 80 °C.

Connection dimensions: Connection spigot (KP) internal thread 1½", heating element connection (MG) internal thread 1½", temperature sensor connection (CT) 3/8", Drainage (ZS) Internal thread 3/4".

Material and insulation

The tank is made of steel (raw interior) with an external corrosion-resistant coating and features 100 mm thick thermal insulation made of soft polystyrene foam. The outer shell is a laminated casing to ensure dimensional stability and an attractive appearance.

Applications and advantages

The WGJ-BE Buffer storage It is suitable for integration with boilers, solar thermal systems and heat pumps. It absorbs excess heat in the short term, prevents frequent cycling of burners and heat generators, and thus contributes to the lifespan and efficiency of the system.

Thanks to its large volume and low heat losses, the storage tank ensures stable flow temperatures and better controllability of the heating system, especially with variable heat generation.

Safety and operating conditions

The storage tank may only be operated with a functioning safety valve (opening pressure 0.3 MPa). Ideally, this valve should be installed in the heating water return line and must not have any shut-off valves between the valve and the tank. The arrow on the valve body must indicate the flow direction.

During operation, water may briefly escape from the safety valve—this indicates correct function and must never be blocked. The system must not be operated without a functioning safety valve, as this could result in danger and damage.

Installation and electric heating

During the warranty period, only electric heaters with insulated heating elements may be used (e.g., ZUG ELEKTROMET type EJK). Single-phase heating cartridges are available in 230 V versions with power ratings of 1.5/2.0/3.0 kW; three-phase versions are available in 400 V versions with 3.0/4.5/6.0/9.0 kW. Connection must be carried out according to the wiring diagrams and by a qualified electrician.

Important: Do not plug in the power cord until the storage tank is completely filled with water. Observe the electrical safety information and the installation instructions for the electric heater. During the warranty period, only approved, insulated heating elements must be used.

Maintenance and service

Check the safety valve's proper function at least once a month and before each restart after a prolonged shutdown. Repairs to the water system must only be carried out by qualified personnel. Regular visual inspections of the insulation and connections increase operational safety.

Warranty and information

Before installation and commissioning, the enclosed installation and operating instructions as well as the warranty conditions should be read carefully.The manufacturer reserves the right to make constructive changes as part of product modernization, which may not necessarily be included in these instructions.

If you have questions about compatibility with existing components or about selecting the right electric auxiliary heater, we will be happy to advise you — please contact your specialist installer or our customer service department.