Pump group Termojet with thermostatic valve 25-55 °C 1" FT in EPP BLACK thermal insulation without pump PG-46EPP

Pump group with thermostatic valve NG-46 in EPP BLACK thermal insulation — a pre-assembled Termojet unit for circuits requiring precise supply temperature maintenance without boiler room automation. The three-way thermostatic valve 25–55 °C blends cooled return water and maintains the set temperature, while the proprietary EPP BLACK jacket minimises heat losses in the boiler room and gives the unit a neat appearance.

The operating principle is based on passive return water blending: as soon as the supply temperature exceeds the set point, the thermostatic mixer adds cooled coolant from the return line. Control without electricity — the valve responds to the coolant temperature mechanically, with no actuators or controllers. Valves with thermometers 0–120 °C on the supply and return allow the mode to be monitored and the circuit to be isolated for maintenance without draining the system. The built-in check valve prevents parasitic circulation between adjacent circuits.

Typical scenarios: underfloor heating (it is critical to keep the temperature below 55 °C), low-temperature radiator heating, systems with solid-fuel and gas boilers. For low-temperature heat pump systems, this group ensures precise circuit temperature maintenance — if you are selecting heat pump equipment, see Termojet heat pumps. The group is mounted on Termojet distribution manifolds with a standard centre-to-centre distance of 125 mm, for example manifold K22VN.125 2+1 up+down.

Advantages of the Termojet pump group:

• EPP BLACK thermal insulation — higher thermal resistance and minimal heat losses compared to standard jackets;
• fully assembled and factory-tested unit — installation in minutes;
• union nut connections on the supply and return — quick servicing without welding;
• Ukrainian manufacture, competitive price, manufacturer's warranty.

Technical parameters: maximum capacity 15 kW at ΔT=10 °C and 30 kW at ΔT=20 °C, Kvs 3,5 m³/h, connection to the manifold and heating circuit — 1″ female thread, working pressure up to 3 bar, height 395 mm, width 250 mm, volume 0,34 l. Circulation pump installation length — 180 mm; the pump is not included, we recommend the energy-saving Termojet APE 25-60 circulation pump (180 mm). For connection to a manifold with 1¼″ outlets, use adapter KP125/150.

Other models with thermostatic valve and straight pump groups are available in the Termojet pump group catalogue.

Frequently Asked Questions

How does this group differ from the NG-46 with standard insulation?
The EPP BLACK jacket material provides better thermal insulation properties and increased thermal resistance; the pump installation length is 180 mm instead of 130 mm.

Is boiler room automation required to control the 25–55 °C valve?
No. The thermostatic valve responds to the coolant temperature mechanically — this is an electronics-free solution, suitable for simple boiler rooms with manual or basic control.