Air and dirt separator Termojet Dn20 (3/4")

The Termojet TJVT6G20 combined separator is a 2-in-1 device that simultaneously removes microbubbles of air and solid dirt particles from the heating fluid. One installation point instead of two separate devices: space savings, fewer fittings and connections, lower overall installation cost. DN20 (3/4") is suitable for heating systems with boilers up to 15–20 kW.

Technical Specifications

How It Works

One body — two functional chambers. The upper section with a coalescent insert made of welded copper wires handles deaeration: microbubbles adhere to the insert surface, merge, and are discharged through the automatic air vent. The lower section is a gravity separation chamber: flow velocity drops sharply and solid particles of rust, sand, and sludge settle to the bottom. The drain valve at the bottom allows accumulated dirt to be flushed in 10–30 seconds without stopping the system.

Where and How It Is Used

• New heating system. The ideal solution for a new installation: one device immediately solves both tasks — deaeration and removal of mechanical particles that enter the system during installation.
• Gas or condensing boiler up to 20 kW. DN20 matches the standard connection port — installed between the boiler and the distribution manifold.
• Homes with underfloor heating. Underfloor heating systems are particularly sensitive to sludge: the narrow loops of plastic pipes clog easily. The 2-in-1 separator protects the entire circuit from a single point.
• System with a heat pump. If the system includes a heat pump, in addition to the combined separator it is recommended to install a separate magnetic dirt separator — it captures magnetite (Fe₃O₄), which the combined device does not catch. More about heat pump protection at tjheatpump.com.ua.
• Limited installation space. Two tasks — one device: if boiler room space is tight, the combined separator replaces two separate units.

Advantages of Termojet TJVT6G20

• 2-in-1 — complete fluid purification from a single installation point: from both air and mechanical contaminants.
• Dirt flushing without stopping the system — the drain valve is opened for 10–30 seconds while the boiler is running.
• The coalescent insert is not replaceable and requires no maintenance — the system “cleans itself.”
• For more complex layouts where an air separator is needed at one point and a dirt separator at another, consider separately the air separator DN20 and the dirt separator DN20.

Frequently Asked Questions

2-in-1 or two separate devices — which is more cost-effective?
For most standard systems — 2-in-1. One installation point, fewer connections, lower overall price. Two separate devices are justified when there is a specific requirement: for example, the air separator must be placed after the boiler (the hottest point) and the dirt separator on the return pipe before the boiler. In that case a single combined device cannot physically be in two places at once.

How often should dirt be flushed?
First inspection — 3–6 months after commissioning a new system (first-season corrosion is most active). Then — once a year during boiler maintenance. The procedure takes 10–30 seconds: open the drain valve at the bottom of the separator, let the water flow out with the sediment, close. The system continues to operate.