Pump group Termojet with thermostatic valve 25 - 55* 1" FT in thermal insulation without pump PG-46 (26)

Pump group with thermostatic valve NG-46 — a pre-assembled Termojet unit for circuits requiring precise supply temperature control without boiler room automation. The three-way thermostatic valve maintains the supply temperature in the range of 25–55 °C, while the thermal insulation jacket minimises heat losses in the boiler room.

The operating principle is based on return water blending: as soon as the supply temperature exceeds the set point, the thermostatic mixing valve adds cooled coolant from the return line, and the circuit receives a stable temperature regardless of the boiler operating mode. The built-in check valve prevents parasitic circulation, while the valves with thermometers 0–120 °C on the supply and return lines allow the circuit mode to be monitored and the circuit to be isolated for maintenance without draining the system.

Typical applications include underfloor heating, low-temperature radiator heating, and temperature-limited circuits in systems with solid-fuel and gas boilers. Thanks to precise temperature control, the pump group with thermostatic valve is also well suited for heat pump systems: if you are selecting equipment for low-temperature heating, see Termojet heat pumps. In the boiler room, the group is mounted on a distribution manifold K22V.125 (2+1, outlets up) with a standard centre-to-centre distance of 125 mm.

Advantages of the Termojet pump group:

• installation-ready unit: shut-off valves, thermometers, check valve, and mixing thermostatic valve are already assembled and tested at the factory;
• thermal insulation jacket included — minimum heat losses and a neat boiler room appearance;
• union nut connections on the supply and return — quick installation and removal without welding;
• Ukrainian manufacture: competitive price, stock availability, and official manufacturer's warranty.

Technical parameters: maximum circuit 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 6 bar, dimensions 353×261 mm, volume 0,34 l. Circulation pump installation length — 130 mm; the pump is not included, the energy-saving Termojet APE 25-60 pump (130 mm) is the optimal choice. For connection to a manifold with 1¼″ outlets, use adapter KP125/150.

The full product range — straight groups and models with other thermostatic valve ranges — is available in the Termojet pump group catalogue.

Frequently Asked Questions

Is the circulation pump included?
No, the pump is purchased separately. Installation length — 130 mm; the optimal choice is the energy-saving Termojet APE 25-60 (130 mm).

What is the thermostatic valve 25–55 °C for?
It automatically blends the return water and maintains the set supply temperature — protecting underfloor heating from overheating without expensive boiler room automation.