electric heating elements for radiators and towel rails - Rotfil

ELECTRIC HEATING ELEMENTS
FOR RADIATORS AND TOWEL RAILS

Rotfil s.r.l. established in 1977 is the first manufacturer in Italy of cartridge heaters and is also the head
quarter of a group of international companies including Jeka GmbH in Germany, AZ Technology in Tunisia
and Elmat srl in Italy.
Rotfil s.r.l. offers, therefore, a complete range of electric heating elements for radiators and towel rails including:
- PTC self limiting elements Rotfil
- Constant power heating element class I with thermostat + thermofuse TOP Jeka
- Constant power heating element class II with thermostat + thermofuse
- Heating cables for Radiators and Towel-dryers
- Flexible heating elements Elmat
Rotfil srl quality system is certified ISO 9001 since 1996 and for its heating elements for radiators and towel
rails has obtained a wide range of certifications including VDE, UL, CSA.
Rotfil s.r.l. continues with always greater determination its continuous growth path started more than 30
Year ago, offering also for the household market its long experience accumulated in the development of
electric heaters for the most different applications including automotive, industrial, military, medical,
nuclear, aeronautical, space etc.
2
UNI EN ISO 9001:2000
CERT-00858-96-AQ-TRI-SINCERT

What does PTC technology mean?
PTC means "Positive Temperature Coefficient" and characterizes the electrical behaviour of the
semiconductor heater segment that is the base component of the heating element.
Each semiconductor element generates the heat output as the thin resistive wire in a constant power
heater, but with a very significant difference: with increasing temperature the resistance of the PTC element
rises instantaneously and reduces automatically the power output (P = V 2 /R) generating the so called
"self-limiting" effect.
Many segments are combined inside a PTC Rotfil heater generating therefore the desired output in a very
wide power range (from 30 W to 1500 W and even more).
°C
°C
Watt
Watt
PTC ROTFIL HEATER
Time
CONSTANT POWER HEATER Time
How do Rotfil PTC elements work?
The Rotfil PTC elements can be assembled both horizontally or vertically inside a fluid filled radiator
(water with anti-freeze protection).
Depending on the combination radiator / PTC heating element, the system will reach an equilibrium
surface temperature. The PTC self-limiting effect will prevent over temperatures.
The heating up process will automatically go through three phases:
- 1. start- up
In the first 60 sec the PTC works at 130% circa of the nominal power ( "turbo boost power" effect)
to trigger best the convection inside the radiator.
- 2. nominal power phase
In this phase the PTC heating elements reaches the equilibrium temperature working at the nominal power
- 3. energy saving phase
With the increasing of the ambient temperature the power output decreases until a new equilibrium
is reached where the power consumption is reduced ( typically at 70% - 80% of the nominal power)
3

Which are the advantages of Rotfil PTC elements for the radiator manufacturers?
- Intrinsic safety (no risk of overheating, burnings or fire)
- No need of thermofuse and therefore no more burnt heaters also in case of partial filling
- Reduced diameter and length vs constant power heaters (in particular 11 mm diameter also for class II elements)
- No cold lengths (differently form constant power heaters which require not heating zones for the
thermostat and the thermofuse)
- Better circulation and faster heat-up times
- Absolutely no noise due to cavitation effects
- Uniform heating also for "design" radiators with very narrow space around the heater (in some cases
it would be even impossible to work with constant power heaters because thermostat would switch
off before circulation starts properly).
- Tanks to the investment for the product development and industrialization, Rotfil has made PTC technology
affordable and cost effective for the radiators and towel rails market allowing solutions until
now simply impossible.
Ø16
500W class II –constant power heater
Ø11
500W class II – Rotfil PTC heater
cold cold cold
Constant power heater
Rotfil PTC heater
4

Why is Rotfil PTC Technology more advanced?
Thanks to the experience derived from many other applicative fields, Rotfil srl has been the first heater
manufacturer to invest in the advantages of the PTC self-limiting heaters for the electric radiators and towel
dryers market ,Rotfil is now proud to be recognized by the leading Radiator manufacturers worldwide as
a reference and milestone for this specific technology.
Rotfil srl is proud to have been the first to define with VDE engineers the standard to measure the wattage
for the PTC for radiator application. The power is defined in such a way reproducing effectively the
wattage released in the real application.
Thanks to the very limited in-rush current effect of Rotfil PTC heaters, there is absolutely no counter
indication and the elements work properly with the electronic ambient thermostats normally used for
the constant power heaters.
Moreover, Rotfil PTC heaters are the only ones for the radiator market which are made with an innovative
production process (patent pending) which obtains the internal insulation without magnesium oxide,
thus eliminating completely any potential risk of
contamination of the semiconductor segments
through this hygroscopic material.
This makes the Rotfil PTC heaters unbeatable for
reliability and long-lasting duration.
Why does the "easy-connection systems
ROTFIL" make Your life simpler?
Rotfil PTC heating elements are now also available
with the innovative "quick fit " system which, thanks
to a IP64 connector, allows the inter- changeability
of the cable with incredible advantages in terms of:
- product standardization and stock rationalization
- extreme flexibility (no more problems of cable too
short or with the wrong plug)
- simple assembly of the heating elements on the radiator since there is no cable (the cable can be assembled
in a second step by the radiator manufacturer according to length, plug type etc. requested by the customer).
Rotfil PTC heating elements range
At pages 6 – 12 of this catalogue You can find the technical data sheets of the main standard Rotfil PTC
heating elements.
Upon request other types are available with special wattages or exits: Rotfil technical office will put at disposal
of the customer its significant experience to develop the most suitable product for every single application.
Rotfil PTC elements are developed for water filled radiators, but upon request special PTC elements are available
also for oil filled radiators and towel rails.
5

PTC heating elements Class I with cable without Plug
Normal type
“Quick-fit” type
Cable Cu/PVC
3X0.75
H05VV-F VDE
L=1500
Cable Cu/PVC
3X0.75
H05VV-F VDE
L=1500
NORMAL TYPE
L
O-RING
1/2” G
Power to
60°C
40W
75W
100W
150W
200W
250W
300W
400W
450W
500W
600W
750W
900W
1000W
1250W
1500W
L
+0
-5%
125mm
125mm
135mm
165mm
205mm
245mm
245mm
325mm
365mm
370mm
450mm
535mm
635mm
675mm
795mm
940mm
L
QUICK FIT TYPE
O-RING
1/2” G
Ø 11
IP64
CLASSE I
230V
Ø 11
6

PTC heating elements Class I with cable with Schuko Plug
Normal type
“Quick-fit” type
Cable Cu/PVC
3X0.75
H05VV-F VDE
L=1500
Cable Cu/PVC
3X0.75
H05VV-F VDE
L=1500
Schuko plug
Schuko plug
NORMAL TYPE
L
O-RING
1/2” G
Power to
60°C
40W
75W
100W
150W
200W
250W
300W
400W
450W
500W
600W
750W
900W
1000W
1250W
1500W
L
+0
-5%
125mm
125mm
135mm
165mm
205mm
245mm
245mm
325mm
365mm
370mm
450mm
535mm
635mm
675mm
795mm
940mm
L
QUICK FIT TYPE
O-RING
1/2” G
Ø 11
IP64
CLASSE I
230V
Ø 11
7

PTC heating elements Class I with cable with Switch Plug
Normal type
“Quick-fit” type
Cable Cu/PVC
3X0.75
H05VV-F VDE
L=1500
Switch plug
Cable Cu/PVC
3X0.75
H05VV-F VDE
L=1500
Switch plug
NORMAL TYPE
L
O-RING
1/2” G
Power to
60°C
40W
75W
100W
150W
200W
250W
300W
400W
450W
500W
600W
750W
900W
1000W
1250W
1500W
L
+0
-5%
125mm
125mm
135mm
165mm
205mm
245mm
245mm
325mm
365mm
370mm
450mm
535mm
635mm
675mm
795mm
940mm
L
QUICK FIT TYPE
O-RING
1/2” G
Ø 11
IP64
CLASSE I
230V
Ø 11
8

PTC heating elements Class II with cable without Plug
Normal type
“Quick-fit” type
Cable Cu/PVC
2X0.75
H05VV-F VDE
L=1500
Cable Cu/PVC
2X0.75
H05VV-F VDE
L=1500
NORMAL TYPE
L
O-RING
1/2” G
Power to
60°C
150W
200W
250W
300W
400W
450W
500W
600W
750W
900W
1250W
1500W
L
+0
-5%
165mm
205mm
245mm
245mm
375mm
365mm
370mm
450mm
535mm
635mm
825mm
990mm
L
QUICK FIT TYPE
O-RING
1/2” G
Ø 11
IP64
CLASS II
230V
Ø 11
9

PTC heating elements Class II with cable with Plug
Normal type
“Quick-fit” type
Cable Cu/PVC
2X0.75
H05VV-F VDE
L=1500
Cable Cu/PVC
2X0.75
H05VV-F VDE
L=1500
Plug
Plug
NORMAL TYPE
L
O-RING
1/2” G
Power to
60°C
150W
200W
250W
300W
400W
450W
500W
600W
750W
900W
1250W
1500W
L
+0
-5%
165mm
205mm
245mm
245mm
325mm
365mm
370mm
450mm
535mm
635mm
825mm
990mm
L
QUICK FIT TYPE
O-RING
1/2” G
Ø 11
IP64
CLASS II
230V
Ø 11
10

PTC heating elements Class I at 120V with UL approval and coiled cable
with US Plug
L
Ø 11
Power to
60°C 120V
75W
100W
150W
200W
250W
300W
400W
500W
600W
750W
900W
1000W
L
+0
-5%
140mm
155mm
190mm
220mm
255mm
290mm
355mm
425mm
490mm
590mm
680mm
750mm
IP64
CLASS I
120V
1/2” G
Coiled cable
PVC plated CU
3X18 AWG
type SVT or SJT
UL/CSA R/C
Length=1000 in extension
O-RING
UL angle 90°
type plug
11

PTC heating elements Class II with faston
L
Ø 11
Faston
POWER IN
WATER TO 60°C
L
+0
-5%
1/2” G
O-RING
500W
600W
700W
900W
1000W
1250W
1500W
370mm
435mm
475mm
620mm
660mm
825mm
950mm
IP64
CLASS II
230VAC
12

Constant power heating elements Class II with thermostat and thermofuse
With faston type
With lead wires type
Faston male 6.3X0.8
Plastic cap
Faston female
6.3X0.8
+ faston-cover
L
O-RING
M21
Thermofuse 152°C
Power
500W
600W
700W
750W
900W
1000W
1250W
1500W
L
+0
-5%
400mm
470mm
510mm
520mm
650mm
690mm
760mm
900mm
L 55
Copper cable, PVC isolation
M16
O-RING
M21
Ø 14
Thermofuse 121°C
Thermostat 100°C
Ø 16
IP64
CLASS II
230V
Ø 16
Thermostat 100°C
13

Accessories
As complement to its range of heating elements for radiators and towel-dryers, Rotfil srl
offers upon request also:
Electronic ambient
thermostats
Heating cables for
radiators and towel dryers
High quality "T" fittings
L 100
Cold zone
Cable CU/PVC
3X0.75 L=1500
Heating cable:
silicon insulation
1/2” G
Plug
Power
15W/m
30W/m
45W/m
Tension
230V
230V
230V
Custom made packaging, with possibility to include different products, are available upon request
14

Flexible heating elements Elmat
In the radiators and towel rails market there is an always increasing request of flexible
heating elements to be applied with adhesive on the rear of the so called "dry" radiators.
Elmat flexible heating elements can be easily adapted to curved surfaces, or in case of small
tube sizes and allow uniform heating also of the lower parts of the radiators. Upon request
they can also be supplied with integrated temperature control systems.
Elmat flexible heating elements can be made according also to very special shapes, for the
ambient heating of small spaces through "decorative" devices (artistic pictures etc.) and
can be also applied as
"mist remover" system on
bathroom mirrors.Other
applications concern the
heating of second
houses, in downtown
and historical centre
houses where there is not
the possibility to heat
with gas or conventional
piping systems, as well
as for protection of
valuable surfaces with
frescos or mosaics.
For floor heating application, Elmat flexible heating elements can be made as coils or
as modular elements.
Typical applications are for ambient heating of corridors, bathrooms, gymnasiums, churches etc.
The simplicity of application allows the design of very effective ambient heating solutions
with low installation and operation costs.
They can be applied on existing floors, allow localized heating also in large ambient
and can be covered with the most different surfaces like moquettes, carpets, woods etc.
Technical data:
Working temperatures: from -50°C to +100°C and specific wattages form 0,001 to
0,2 W/sqcm, Insulation material Mylar® (higher temperatures and specific wattages
possible with silicon).
Possibility of reinforced and double insulation.
15

ROTFIL s.r.l.
Via Praglia, 15 - 10044 PIANEZZA (TO) ITALY
Tel. +39-011-9683-111 - Fax +39-011-9683-225
e.mail: info@rotfil.com - www.rotfil.com
COMPANY
WITH QUALITY SYSTEM
CERTIFIED BY DNV
= UNI EN ISO 9001/2000 =
Elmat s.r.l.
Vicolo L. Negrelli 8
31038 Paese loc. Castagnole (TV) - Italy
Tel +39-0422-484-198
Fax +39-0422-482-868
e.mail: info@elmatsrl.it
www.elmatsrl.it
JEKA GmbH
Kalterer Straße 27
D-64646 Heppenheim
Deutschland / Germany
T. +49-(0)6252-95920-0
F. +49-(0)6252-95920-95
e.mail: info@jeka-heppenheim.de
www.jeka-heppenheim.de