Termojet Pump Groups: Types and Applications
A pump group is a ready-to-install assembly with a circulation pump, thermometers, and — where required — a mixing unit. We break down the actual Termojet НГ series and explain which one to use where.
A pump group is a complete piping assembly for a heating circuit: a housing with thermal insulation, a space for the circulation pump, shut-off valves with thermometers, and — depending on the type — a mixing unit. A ready-made group reduces circuit installation from hours to minutes and eliminates assembly errors.
Straight Groups (without mixing unit)
Deliver coolant to the circuit at boiler temperature. Designed for radiator heating, domestic hot water cylinders, or swimming pools.
- НГ-37 — straight group, 1", for circuits up to ~40 kW.
- НГ-47, НГ-51, НГ-61, НГ-71 — straight groups of larger diameters (1", 1¼", 1½", 2") for corresponding capacities.
Groups with Mixing Unit
Fitted with a three-way mixing valve that blends return flow into the supply to maintain the set circuit temperature. Essential for underfloor heating.
- НГ-38 / НГ-38А — with mixing unit, 1".
- НГ-52 — with mixing unit, 1¼", for higher-capacity circuits.
- НГ-62, НГ-82 — 1½" and 2½" for large systems.
Groups with Thermostatic Valve
- НГ-36, НГ-46 — with thermostatic valve for temperature control without external controls.
Groups with A-413 Drive Controller
A dedicated series with an electric actuator A-413 that automatically maintains a constant supply temperature. Convenient for underfloor heating without a separate controller.
EPP Insulation Versions
The EPP BLACK series — pump groups in a moulded EPP housing: superior thermal insulation, a neat appearance, and zero condensation.
Which Pump to Install
Termojet equips its groups with energy-efficient APE and APM pumps with electronic control — they consume significantly less power than older models, which is especially important when running on backup power.
Advantages of Ready-Made Groups
- Saves hours of installation compared to site-welded pipework.
- Factory-set hydraulics and balancing.
- Compact design and ease of maintenance.
Select the group by pipe diameter and the calculated circuit flow rate — see a separate blog article for the formula.
