Dirt separator Termojet Dn40 (1 1/2")

Termojet DN40 magnetic dirt separator — a solution for medium-capacity and commercial heating systems. Flow capacity 6.8 m³/h covers boiler rooms up to 60–80 kW. Brass body withstands 110°C and 10 bar. Built-in neodymium magnetic rod captures magnetite Fe₃O₄ — the ferromagnetic iron sludge from corrosion that conventional separators miss. Installed on the return pipeline before the boiler, pump group, or heat exchanger.

Technical Specifications

How It Works

The heat carrier enters the wide separator chamber — flow velocity drops sharply. Heavy non-magnetic particles: sand, scale, iron oxides — settle to the bottom under gravity. Simultaneously, the neodymium rod at the centre of the chamber captures ferromagnetic magnetite particles — those too small or light for gravitational settling. The result is dual separation: what settles and what is held by the magnetic field. Collected sludge is drained via the drain valve without stopping the system. Cleaning the magnetic rod: remove it, wipe off the black deposit, reinsert.

Applications

• Boiler room 40–80 kW (gas, pellet, solid-fuel boiler). DN40 is the standard return pipe diameter for medium-capacity systems. Protects the boiler heat exchanger from sludge accumulation, which reduces heat transfer and increases fuel consumption.
• Pump group. The circulation pump is sensitive to abrasive particles in the heat carrier: a magnetic separator upstream of the pump eliminates the risk of premature wear.
• Medium-capacity heat pump. Magnetite in the narrow channels of the plate heat exchanger is the primary cause of COP drop and emergency shutdowns. Learn more at tjheatpump.com.ua.
• Retail premises, offices, hotels. Central heating with DN40 requires reliable protection of fittings and heat exchange equipment — without shutdowns for cleaning.
• System after renovation or flushing. In the first weeks after restoration work, sludge and corrosion products are at elevated concentrations — the DN40 separator ensures rapid cleaning without intervention.

Advantages

• Dual separation — magnetite and non-magnetic particles: one device instead of two.
• Drain without shutdown — drain valve at the bottom of the body; servicing takes a few seconds.
• Removable neodymium rod — magnet cleaning without dismantling the separator or draining the system.
• Brass body 110°C / 10 bar — no restrictions for any boiler type in the DN40 power range.

Magnetic Separator and Heat Pump

Heat pump systems require special protection. Magnetite — black iron sludge from corrosion — accumulates in the narrow channels of the plate heat exchanger and gradually reduces its efficiency. A conventional dirt separator does not retain magnetite, because it is non-magnetic by nature for a gravitational separator. Only a neodymium rod reliably extracts these particles from the heat carrier. Learn more about heat pump systems at tjheatpump.com.ua.

Related Products

If simultaneous air and dirt removal is needed, consider the Air and Dirt Separator DN40. For installation in tight boiler rooms or where straight pipe run is limited, the Angled Dirt Separator DN40 is a good fit. Full range — in the Termojet separator catalogue.

Frequently Asked Questions

Is a magnetic separator needed if the boiler is new?
Yes, especially at the initial stage. A new system produces the most corrosion sludge in the first 3–6 months — when steel and cast-iron components are still “bedding in”. This is when magnetite is actively forming and spreading through the circuit. A magnetic separator installed at start-up prevents primary contamination of the boiler heat exchanger and all fittings.

What is the difference between DN40 and DN32 when choosing a dirt separator?
The DN selection matches the pipe diameter on which the separator is installed. DN40 (1 1/2") is designed for systems with a flow capacity up to 6.8 m³/h — typically boiler rooms of 40–80 kW with the corresponding pipework. If your pipe is DN32, choose the Dirt Separator DN32.