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    LK Armatur is a leading producer in Europe, manufactures millions of valves per year for the global HVAC market. Our solutions are based on a comprehensive view of how valves, control units, components and prefabricated products work together. Svenska English Deutsch Italiano Yкраїнська Suomi

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    LK Systems is the leading manufacturer of easy-to-install systems for heating and tap water distribution and pre-insulated pipes in the Nordics. Through our prefabrication factory, we also provide tailor-made solutions that simplify the installation process even further. Svenska English Norsk Suomi

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    Our PEX Pipe Extrusion business area is an innovative manufacturer of high-quality plastic pipes for the heating and plumbing industry. Our core is the efficient, high-technology production process for crosslinked PE-Xa pipes, resulting in products with a unique combination of flexibility and hydrostatic strength. English

  • LK Group

    LK is a family-owned trading and production group, operating on a global scale within the HVAC-area. We are the market leader in Sweden and has an increasing sales of products, systems and solutions in the Nordic countries, Europe and the USA. Svenska English
LK 842 ThermoMix® P

LK 842 ThermoMix® P

  • Flange connection
  • Simple motorisation

LK 842 ThermoMix® P is a 4-way mixing valve for mounting on heating boilers. LK 842 ThermoMix® P is suitable for motorization. The valve can be mounted at any angle. LK 842 ThermoMix® P can easily be adapted ...

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LK 842 ThermoMix® P

  • Variants
  • Detailed Information
  • Documentation
  • Accessories & Spare parts
  • Questions & Answers

Variants

LK 842 - Male thread

LK 842 - Male thread 1 artikel

Article Dim. Kvs m³/h A mm B mm C mm D mm E mm F mm G mm H mm L mm Weight (kg) Dimensional sketch Item List
180879 M ¾" 5.5 84 62 74 97 31 94 30 67 24 0.8

180879

Dim. M ¾"
Kvs m³/h 5.5
A mm 84
B mm 62
C mm 74
D mm 97
E mm 31
F mm 94
G mm 30
H mm 67
L mm 24
Weight (kg) 0.8
Dimensional sketch
Item list
LK 842 - Compression fitting

LK 842 - Compression fitting 2 variants

Article Dim. Kvs m³/h A mm B mm C mm D mm E mm F mm G mm H mm L mm Weight (kg) Dimensional sketch Item List
180880 15 mm 5.5 99 62 74 97 31 94 30 67 24 0.8
180881 22 mm 5.5 99 62 74 97 31 94 30 67 24 0.8

180880

Dim. 15 mm
Kvs m³/h 5.5
A mm 99
B mm 62
C mm 74
D mm 97
E mm 31
F mm 94
G mm 30
H mm 67
L mm 24
Weight (kg) 0.8
Dimensional sketch
Item list

180881

Dim. 22 mm
Kvs m³/h 5.5
A mm 99
B mm 62
C mm 74
D mm 97
E mm 31
F mm 94
G mm 30
H mm 67
L mm 24
Weight (kg) 0.8
Dimensional sketch
Item list

Detailed Information

Description

LK 842 ThermoMix® P is a 4-way mixing valve for mounting on heating boilers.

LK 842 ThermoMix® P is suitable for motorization.

The valve can be mounted at any angle. LK 842 ThermoMix® P can easily be adapted for right- or left-hand mounting.

The valve requires no maintenance but the installation should be checked regularly.

Technical Data

Angle of rotation: 90°
Max. working pressure: 1.0 MPa (10 bar)
Working temperature: Min. 5 °C/Max. 110 °C (120 °C briefly)
Ambient temperature: Min. 5 °C/Max. 60 °C
Thread standard: G - male thread
Media: Water - Glycol mixture max. 50% Ethanol mixture max. 30%
Material, valve body: Brass EN 1982 CB753S
Material, internal cover: PPS Composite
Material, external cover: Aluminium
Material, slide/spindle: Brass EN 12165 CW617N
Material, sealing: EPDM
Spindle sealing: Two O-rings

Application

LK 842 ThermoMix® P
LK 842 ThermoMix® P

Technical Diagrams

LK 842 ThermoMix® P

Capacity Diagram

LK 842 ThermoMix® P

Valve Characteristics

Documentation

Product sheet

LK 842 ThermoMix® P

Instruction manual

842 ThermoMix - Instruction_048959

Certificate/Type approval

CE Declaration of Conformity - 830, 831, 840, 841, 842, 845, 846.pdf

Accessories & Spare parts

Article no. Article Position
013083 Gasket 842 1
187067 Sealing kit 840/841/842, DN 25-32 2
187071 Repair kit 841/842, DN 25-32 3

Questions & Answers

Is the LK SmartComfort compatible with a mixing valve from another manufacturer?

Yes, we provide mounting kits for other models, see Mounting kits on our website.

12 June 2026