Description

Uponor Thermo Twin 40mm + 40mm 175mm Pre-Insulated District Heating System

The Uponor Thermo Twin 40mm + 40mm 175mm is a pre-insulated underground heat main designed for district heating systems and building connections.. The Thermo Twin configuration combines flow and return heating lines within one insulated jacket, helping reduce trench width and simplify installation compared with installing separate heating lines.

Part of the Uponor Ecoflex underground insulated heating system, Thermo Twin is widely used for heat main installations between plant rooms, residential buildings and commercial heating systems.

Each system uses PE-Xa service pipes with EVOH oxygen barrier (SDR 11) surrounded by PE-X foam insulation and protected by a durable HDPE outer jacket, making it suitable for buried district heating installations and underground heat main distribution systems.

The twin configuration includes a separation profile between the pipes, helping installers clearly identify the flow and return connections during installation.

The system is rated for up to 6 bar pressure and 95°C operating temperature and is designed for use with Uponor Wipex 6 bar couplings.

Typical applications include district heating systems, underground heat mains and heating connections between buildings.

Key Features

Uponor Thermo Twin pre-insulated underground heating system
40mm + 40mm service pipes / 175mm outer jacket
Flow and return heating lines within one insulated jacket
PE-Xa medium pipes with EVOH oxygen barrier (SDR 11)
PE-X foam insulation
HDPE outer jacket for underground protection
Rated 6 bar / 95°C
Compatible with Uponor Wipex 6 bar couplings
Optional heating cable available
Typical delivery 5–10 working days

Don’t forget your end caps and fittings – see related products below for the correct terminating kit.

Uponor Ecoflex Thermo Twin PN6 Pipe Range

Item No.	Medium Pipe d x s (mm)	Medium Pipe d1 x s1 (mm)	DN	Jacket Pipe d2 (mm)	Bending Radius (m)	Weight (kg/m)	Max Length on Delivery (m)	U-Value (W/K·m²)
1018134	25 x 2.3	25 x 2.3	20 + 20	175	0.50	2.20	200	0.201
1018135	32 x 2.9	32 x 2.9	25 + 25	175	0.60	2.40	200	0.241
1018136	40 x 3.7	40 x 3.7	32 + 32	175	0.80	2.60	200	0.293
1018137	50 x 4.6	50 x 4.6	40 + 40	200	1.00	3.50	100	0.314
1018138	63 x 5.8	63 x 5.8	50 + 50	200	1.20	4.55	100	0.420
1088276	75 x 6.8	75 x 6.8	65 + 65	250	1.40	6.50	100	0.369