DH boxes - the insulation system for district heating applications


As specified in §6 paragraph 1 of the former Heating Systems Ordinance, and in accordance with Annex 5 of the Energy Conservation Ordinance (EnEV) introduced in 2002, all components of a district heating transmission station must be adequately insulated. To ensure trouble-free maintenance of the station after commissioning, often removable insulation elements are demanded.


The DH box system (District Heating Boxes) is a specially developed insulating program for efficient and cost-effective insulation of district heating transfer stations. It consists of molded PUR rigid foam parts that are suitable for insulating pipes, bends and all fittings.


Thanks to dramatic savings in installation costs the DH box system is a cost-effective alternative to all conventional types of insulation.


Use of the DH boxes reduces the calculation risk considerably as the individual insulating components can be taken from the system drawing and thus the material requirements can be specified in advance.


Processing of the DH boxes is possible in the manufacturing plant of the transfer station, and it is also possible on site after commissioning. The DH boxes are mounted with clamping rings around the pipelines and fittings. Thus the insulation shells can be taken off quickly and easily.


The current price list can be downloaded in the category Service.


DH boxes for

flanged fittings


Series F straight seat

for ball valves and non-return valves in straight seat form, overall length F1.


Series F slant seat

for ball valves, non-return valves and strainers in slant seat form, overall length F1


Series C

for compact valves with flange connection, overall length F4


Series AK

for butterfly valves and KSB Boa Super Compact


Series FP

for flange pairs


Series DF

for three-way valves with flange connection




DH boxes for

sleeved fittings


Series MS

for sleeve slant seat valves


Series KH

for ball valves and straight seat fittings with sleeve connection


Series KH flat

for ball valves with short spindles


Series DM

for three-way sleeve fittings


Series Kähler

for strainers type Kähler


Series Högfors

for strainers type Högfors


Technical data


Material.............................


Specific density................

Thermal conductivity........

Application temperature...

Nominal widths.................

Building material class......

Polyurethane black /

water-driven PUR foam

55 - 60kg/m3

0,029 W/mK

up to 130°C

DN 15 to DN 125

B2 in accordance with DIN 4102

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DH boxes for

pipes and pipe bends


Pipe insulation

for pipe elements,

50% and 100% insulation,

length 500 mm






Pipe bend insulation

for pipe bend elements,

50% and 100% insulation,

radius 90°, R1.



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