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: Underfloor heating

Underfloor heating

Dimplex is always the right choice, as the four Dimplex systems (HM…R, HM…RS, HM…SF, HM…TS) allow all types of electric underfloor heating to be implemented.

Underfloor storage heating

The heater mats are laid under the screed flooring. Heater mats with the HM…R system (without protective jacket) or HM…RS system (with protective jacket) are used. Heat is stored in the heavier screed flooring layer.

Direct underfloor heating in the screed flooring

The heater mats are laid in or under the screed flooring. Heater mats with the HM…R system (without protective jacket) or HM…RS system (with protective jacket) are used.

Direct underfloor heating with thin mortar bed technology:

Thin mortar bed heater mats with the HM…SF and HM…TS systems are laid directly into the tile adhesive or levelling material. The prerequisite for these systems to be used is a thermally-insulated, temperature-resistant foundation which can be walked on. The room temperature is regulated using a room temperature controller with an additional floor temperature sensor.
When designing the system, it must be ensured that the heat output of the heat floor surfaces is sufficient to cover the heat load of the room. Supplementary heating is usually required for small heated floor areas (e.g. bathrooms).

Underfloor temperature stabilisation with thin mortar bed technology:

Comfortable underfloor temperature stabilisation can be achieved by simply laying the HM…SF or HM…TS heater mats directly into the tile adhesive or the levelling material. The floor temperature is simply regulated through the use of a floor temperature controller. The actual room temperature is achieved via a different heating system. This also requires a thermally-insulated, temperature-resistant foundation which can be walked on. A combination of underfloor temperature stabilisation and a domestic hot water underfloor heating system is conceivable, e.g. for comfortable floor temperature stabilisation during the summer months and transition periods.

: Balanced temperature distribution

To know them is to love them: Dimplex electric underfloor heating systems

These systems have proven their viability in domestic heating from the ground up: In apartments, offices and kindergartens. Dimplex electric underfloor heating systems have three main arguments in their favour:

The balanced temperature distribution in the room comes as close as possible to fulfilling the requirements of an ideal heating system. This is because, in contrast to other heating systems, the temperature difference from the room temperature is only minimal. The heating does not produce any dry air.
So you can still keep a cool head, even when your feet are nice and warm. Dimplex heater mats distribute their heat evenly over the entire floor area. So you can keep your feet warm AND keep a cool head.
An advantage for architects and building owners: Increased freedom when designing the rooms, since the heating is invisibly embedded in the floor, so there are no radiators to get in the way.

Dimplex supports you during project planning

Dimplex offers a free service to its partners to help them calculate the heat consumption and design the installation plans: Computer-supported creation of documentation. Simply order the heat consumption calculation questionnaire and then return it to Dimplex together with the building plans (1:50 or 1:100).

Of course, you can also send your documents to us via e-mail: projektierung@dimplex.de

Individual selection of the right underfloor heating from Dimplex

Application	Storage heating		Direct heating in the screed		Direct heating in the levelling material or the tile adhesive	Floor temperature stabilisation in the levelling material or the tile adhesive
Cement screed	min. 80 mm to max. 140 mm, typically 80 mm		min. 45 mm to max. 60 mm, typically 50 mm		Installation height 5 to 10 mm	Installation height 5 to 10 mm
Thermal insulation	Above heated rooms approx. 40 mm to 110 mm above unheated rooms		Above heated rooms approx. 40 mm to 110 mm above unheated rooms		Above heated rooms approx. 40 mm to 110 mm above unheated rooms	Mandatory
Heating system	Living space	Bathroom	Living space	Bathroom	Living space / bathroom	Living space / bathroom
Order reference	HM...R 120 ... up to ... HM...R 180	HM...RS 140 ... up to ... HM...RS 180	HM...R 100 ... up to ... HM...R 160	HM...RS 140 ... up to ... HM...RS 160	HM...SF 150 HM...TS 150	HM...SF 150 HM...TS 150
Heater mat fixing	NHD 100	NHD 100	NHD 100	NHD 100	NHD 100	NHD 100
Cold end extension	KEB 1525 R KES 1525 R	KEB 1525 RS KES 1525 RS	KEB 1525 R KES 1525 R	KEB 1525 RS KES 1525 RS	KED SF set KED TS set	KED SF set KED TS set
Control Charge control Charge controller Floor sensor	ZW 05 DCU F 3113 / F 3110	ZW 05 DCU ZAS 99 DCU AR 05 DCU 2 AR 05 DCU 4 F 3113 / F 3110	Not required	Not required	Not required	Not required
Controller	Not required, temperature is set on the charge controller	Not required, temperature is set on the charge controller	RTW 301 UN RTWU 301 UN	RTW 301 UN RTWU 301 UN	RTW 301 UN RTWU 301 UN	BT 100 AN BT 200 AN BT 301 UN BTU 301 UN BTU 301 AN ETR 060 N BT 060 AN
Sensor sleeve	TFH 821	TFH 821	TFH 821	TFH 821	TFH 821	TFH 821
Temperature limiter	TB 072	TB 072	TB 072	TB 072	TB 072	TB 072

The correct heating screed

Heating screed is applied in the form of floating cement screed. It stores the heat and distributes it evenly over the air in the room. The heating screed must comply with DIN 18560. When laying the screed, ensure that it is properly compressed and the structure is sealed. Its thickness depends on the heat consumption, the charging period, the type of flooring and the mass of the building. The average thickness of the storage heaters is between 8 and 10 cm, and that of the direct heaters is 6 cm.

Dimensioning the power consumption by surface area

The required power consumption by surface area depends on the room temperature, the temperature of the room below, the heat passage coefficient (k_U) and the sum of the service release periods (t_F+ t_ZF). The maximum power consumption by surface area is 180 W/m² for the basic heating of the storage heating, and the minimum power consumption by surface area is 100 W/m². We provide the calculations (thickness of the heating screed and required power consumption) together with the planning documentation.

Please ensure the following

The height of the building storey is increased by at least 4 cm due to the higher floor construction (thicker heating screed). Heater mats should not be installed under fixtures whose entire supporting surface is in contact with the floor (e.g. built-in cupboards and kitchen units). These objects should also be illustrated in the documents which we receive from you. These conditions can then be properly taken into account during project planning. Installation leads are required for heater mats, residual heat sensors, weather sensors and (possibly) room thermostats with temperature monitors.

Installation by the professionals

The heater mats are laid to cover the entire floor space. The backing fabric can be cut to shape, so the mats can be arranged to fit the shape of the room. The exact arrangement of the individual mats can be found in your planning documentation. Special retaining dowels ensure that the heater mats are fixed firmly to the foundation. A 4 m cooling pipe is connected to each mat; this pipe can be shortened or extended. The connecting sleeves are temperature-resistant, completely waterproof and high-tensile. If several heater mats are required in order to cover the entire floor area of a room, the cold ends of the mats are connected in parallel to one another via a connection socket.

How thermal insulation works

In order to limit heat losses below the heating screed, the thickness of the thermal insulation must be taken into consideration. The Ordinance on Thermal Insulation and DIN 4108 must be observed during calculation. The minimum requirements concerning impact noise protection according to DIN 4209 must also be fulfilled. The decisive factor is the heat passage coefficient (k_u) below the heating level. The temperature resistance of the upper insulation layer must be at least 85°C.

The insulation layer is subject to the following minimum requirements:

Basic principles for thermal insulation for underfloor storage and direct heating systems

The thickness of the insulation layer depends on the thermal conductivity group (German: Wärmeleitfähigkeitsgruppe/WLG) of the insulation material used.
k_u = 0,80 W/(m² K)		If situated above rooms heated in the same way
k_u = 0,60 W/(m² K)		If situated above rooms which are partially heated or heated by an external source
k_u = 0,35 W/(m² K)		If situated above outside air or ground

Thermal conductivity group		k_u value in W/(m² K)
Thermal conductivity group		0,8	0,6	0,35
040 ≡ 0,040 W/mK	Δ	40 mm	60 mm	110 mm
040 ≡ 0,030 W/mK	Δ	30 mm	45 mm	85 mm
040 ≡ 0,025 W/mK	Δ	25 mm	35 mm	70 mm
All insulating materials used must have a maximum compressibility of 5 mm. Insulating materials which fulfil standards DIN 18164 and DIN 18165 must be used.

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