manifold Termojet with flow meters for 4 outlets, stainless steel

The Termojet TJ-W manifold with 4 outlets is a distribution unit with built-in flow meters for underfloor heating systems. Made of stainless steel AISI 304 with a thickness of 1.6 mm, so it does not rust and does not require replacement sleeves. Suitable for systems with 4 independent circuits (rooms or zones) and ensures precise balancing of each based on the actual heat carrier flow rate. The optimal choice for an apartment or small house with a heat pump or gas boiler.

Technical Specifications

Operating Principle and Balancing

The manifold distributes the heat carrier from the pump-mixing unit or boiler to 4 independent underfloor heating circuits. Each supply outlet is fitted with a flow meter (rotameter) 0–5 l/min with a transparent cap and a float indicator — you can see the actual flow in each circuit and adjust it manually. A longer loop has greater hydraulic resistance and, without balancing, passes a lower flow rate: the flow meter allows all 4 circuits to be balanced by flow and eliminates overheating of some rooms while others are underheated. The M30×1.5 sockets on the return manifold accept standard thermal actuators (24V or 230V) for zone-by-zone control.

Application Scenarios

• Apartment or small house. 4 circuits cover a typical apartment with 3 rooms, a kitchen, or a corridor — each zone is controlled separately.
• System with a gas boiler. Together with the mixing unit for the manifold, the manifold receives the temperature already reduced to 35–45°C and distributes it evenly across the circuits.
• Heat pump. Low-temperature heat carrier 35–45°C from a heat pump — precisely the range for which underfloor heating is designed. More about this combination below.
• Zone control. Thermal actuators in M30×1.5 sockets + room thermostats = a fully automatic system: each room maintains its own temperature.

Advantages

• Stainless steel AISI 304 — does not rust in open systems, requires no anti-corrosion additives, service life measured in decades.
• Flow meters 0–5 l/min — precise balancing at premium-brand level; flow visible at a glance without pressure gauges or calculations.
• M30×1.5 standard — compatibility with mass-market thermal actuators available in any heating supply store.
• G 3/4" Eurocone — universal connection for PE-RT 16×2 or PE-Xa 16 pipe without adapters.
• Ready package: valve-thermometers, air vents, drain — nothing to purchase separately for basic installation.

Underfloor Heating and Heat Pump

An air-to-water heat pump achieves a maximum COP of 4–5 at a heat carrier temperature of 35–45°C. Underfloor heating is the only heating system that comfortably operates in this range: radiators require 55–70°C, which reduces pump efficiency by 30–50%. The Termojet 4-outlet manifold is the central node of a low-temperature system that allows the heat pump to operate at maximum efficiency. More about integrated solutions — on the Termojet heat pump website.

Frequently Asked Questions

How does a manifold with flow meters differ from a manifold with valves?
A manifold with valves only allows a circuit to be opened or closed. A flow meter shows the exact flow rate in l/min and enables system balancing: setting equal or calculated flow on each circuit. If the circuits are of different lengths (which is almost always the case), without balancing one room will be overheated and another cold. For comparison — see the 4-outlet valve manifold.

Is a mixing unit required for the manifold?
It depends on the heat source. With a gas or solid-fuel boiler (70–80°C) — yes, a mixing unit for the manifold is mandatory: it reduces the temperature to a pipe-safe 35–45°C. With a heat pump that already supplies 35–45°C, a unit may not be needed — direct connection is possible.