Application Guide
Designing hydronic
floor heating
Get the optimum results
7 applications
to help you design
and install Danfoss
floor heating systems.
heating.danfoss.com
THE RIGHT
PRODUCTS FOR
YOUR APPLICATION
Choosing the right products not only depends on the application.
Once you have identified the product groups relevant for your
application, simply go to the Product Guide brochure to narrow
down the choice to specific product codes.
This application guide:
• Recommends specific product groups for different applications
• Recommends which pipe layout pattern to use in different situations
• Shows the benefits and impact of using cement and liquid screed
2 | Hidronik döşemeden ısıtma uygulama kılavuzu
Application guides for
manifolds and controls
05 |
06 |
07 |
08 |
09 |
10 |
11 |
12 |
13 |
Floor heating system with individual room control
Low temperature
Floor heating system with individual room control
High temperature
Floor heating system with individual room control
High and low temperature
Mixed system with individual room control
High temperature
Floor heating system with reference room control
Low temperature
Floor heating system with individual room control
Low temperature and cooling in 2-pipe system
Floor heating system with hybrid Air/Water heat pump with integrated
condensing boiler (example: Itho Cool Cube). Reference room control
Low temperature
Floor heating system with automatic changeover for cooling based on
supply temperature. Individual room control
Low temperature
Mixed system
With self-acting room control
14 |
15 |
16 |
How to design
effective pipe layout
20 |
21 |
22 |
23 |
Floor heating system with individual room control
Low temperature and cooling in 3/4-pipe system
Floor heating 3-pipe system with cooling controlled via motorized valve.
Reference room control
High and low temperature
Floor heating 4-pipe system with cooling controlled via 6-port valve, automatic changeover. Reference room control
High and low temperature
Meander pattern vs. snail pattern
Benefits
Small windows vs. large windows
Pipe distance
Bathroom and kitchen
Laying patterns and distance
Large rooms
Laying patterns and distance
Choosing the right
floor screed
25 |
Liquid screed vs. cement screed
Benefits and impact
heating.danfoss.com | 3
APPLICATION
SYMBOLS
Balancing valves
Manifold with control valves
for actuators
Manifold without control valves
for actuators
Mixing shunt
3-way valve
2-way valve
RA-HC with actuator TWA
FHV self-acting thermostatic valve
Master controller
ECL weather compensator
HP
Hybrid Air/Water heat pump with
integrated condensing boiler
6-port valve
Room thermostat wired
4 | Hydronic floor heating application guide
ESM-11 pipe sensor for supply pipe
for automatic change over between
cooling and heating
Reference thermostat
Dew point sensor
Room thermostat generic
Floor heating system with individual room control
Low temperature
Where to use:
Advantages:
1 and 2
family houses
ü ü ü
• Individual room comfort and energy savings achieved by room thermostats
• Energy savings on heat production and pump energy with connection box relays
• Ensure correct flow to heating system on apartment level with balancing valves and manifold flow setting
Multi family
houses
Light commercial
buildings
Components suitable for application:
Controls Danfoss Link™
Danfoss Icon™
24V / Wireless
ü ü
Manifolds FHF-F FHF FH-ME FHF-B SSM-F SSM
Danfoss Icon™
230V
(ü)*
FH-Wx BacisPlus
ü
(ü)*
2
FHV
ü ü ü ü ü ü
Balancing valve AB-PM ASV-PV + ASV-BD
ü ü
Complementary product suitable for application:
• Mixing shunts are not needed in low supply temperature applications
* Danfoss Icon™ 230 V and BasicPlus² can be combined with connection box to achieve energy savings on heat production and pump energy
with relays
heating.danfoss.com | 5
Floor heating system with individual room control
High temperature
Where to use:
Advantages:
1 and 2
family houses
ü ü ü
• Individual room comfort and energy savings achieved by room thermostats
• Energy savings on heat production and pump energy with connection box relays
• Ensure correct flow to heating system on apartment level with balancing valves and manifold flow setting
Multi family
houses
Light commercial
buildings
Components suitable for application:
Controls Danfoss Link™
Danfoss Icon™
24V / Wireless
ü ü
Manifolds FHF-F FHF FH-ME FHF-B SSM-F SSM
Danfoss Icon™
230V
(ü)*
FH-Wx BacisPlus
ü
(ü)*
2
FHV
ü ü ü ü ü ü
Balancing valve AB-PM ASV-PV + ASV-BD
ü ü
Complementary product suitable for application:
• Mixing shunts to be used in applications with high supply temperatures
• Use ECL to allow for weather compensated supply temperatures.
* Danfoss Icon™ 230 V and BasicPlus² can be combined with connection box to achieve energy savings on heat production and pump energy
with relays
6 | Hydronic floor heating application guide
Floor heating system with individual room control
High and low temperature
Where to use:
Advantages:
1 and 2
family houses
ü ü ü
• Fixed or based on demand supply temperature control
• Low (25 °C to 65 °C) and High (30 °C to 70 °C) temperature modes
• Supply temperature controlling is based on super fast PWM pulsing (patented)
• Auto balancing function by Danfoss Icon™
Multi family
houses
Light commercial
buildings
Components suitable for application:
Controls Danfoss Link™
Danfoss Icon™
24V / Wireless
Danfoss Icon™
230V
FH-Wx BacisPlus
2
ü
Manifolds FHF-F FHF FH-ME FHF-B SSM-F SSM
ü ü ü ü ü ü
Balancing valve AB-PM ASV-PV + ASV-BD
ü ü
Complementary product suitable for application:
• Danfoss Icon™ Expansion module and surface temperature sensor are required for this application
FHV
heating.danfoss.com | 7
Mixed system with individual room control
High temperature
Where to use:
Advantages:
1 and 2
family houses
ü ü ü
• Individual room comfort and energy savings achieved by room thermostats
• Energy savings on heat production and pump energy with connection box relays
• Ensure correct flow to heating system on apartment level with balancing valves and manifold flow setting
Multi family
houses
Light commercial
buildings
Components suitable for application:
Controls
Manifolds
Danfoss Link™
Danfoss Icon™
24V / Wireless
ü ü
FHF-F FHF FH-ME FHF-B SSM-F SSM
Danfoss Icon™
230V
(ü)*
FH-Wx BacisPlus
ü
(ü)*
2
FHV
ü ü ü ü ü ü
Balancing valve
AB-PM ASV-PV + ASV-BD
ü ü
Complementary product suitable for application:
• Mixing shunts to be used in mixed systems where there is a need to differentiate the supply temperature in part of the system e.g.
radiator system with high supply temperature and floor heating with low temperature.
• Use ECL to allow for weather compensated supply temperatures.
* Danfoss Icon™ 230 V and BasicPlus² can be combined with connection box to achieve energy savings on heat production and pump energy
with relays
8 | Hydronic floor heating application guide
Floor heating system with reference room control
Low temperature
Where to use:
Advantages:
1 and 2
family houses
ü ü ü
• Ensure correct flow to heating system on apartment level with balancing valves and manifold flow setting
Multi family
houses
Light commercial
buildings
Components suitable for application:
Controls
Manifolds
Danfoss Link™
Danfoss Icon™
24V / Wireless
ü ü
FHF-F FHF FH-ME FHF-B SSM-F SSM
Danfoss Icon™
230V
(ü)*
FH-Wx BacisPlus
ü
(ü)*
2
FHV
ü ü ü ü ü ü
Balancing valve
AB-PM ASV-PV + ASV-BD
ü ü
Complementary product suitable for application:
• Use manifolds FHF, FHF-F, SSM and SSM-F for easier flow setting
• Rough pre-setting with Allen key
* Danfoss Icon™ 230 V and BasicPlus² can be combined with connection box to achieve energy savings on heat production and pump energy
with relays
heating.danfoss.com | 9
Floor heating system with individual room control
Low temperature and cooling in 2-pipe system
Where to use:
Advantages:
1 and 2
family houses
ü ü ü
• Individual room comfort and energy savings achieved by room thermostats
• Energy savings on heat production and pump energy with connection box relays
• Ensure correct flow to heating system on apartment level with balancing valves and manifold flow setting
• Use floor heating system for passive cooling
Multi family
houses
Light commercial
buildings
Components suitable for application:
Controls Danfoss Link™
Danfoss Icon™
24V / Wireless
ü ü
Manifolds FHF-F FHF FH-ME FHF-B SSM-F SSM
Danfoss Icon™
230V
(ü)*
FH-Wx BacisPlus
ü
(ü)*
2
FHV
ü ü ü ü
Balancing valve
AB-PM ASV-PV + ASV-BD
ü ü
Complementary product suitable for application:
• ESM-11 pipe sensor for automatic change over between cooling and heating based on supply pipe temperature (Danfoss Icon™ 24V
Wireless only)
• Remote controller for configuration of system Danfoss Icon™ 230V
• To use dew point sensor a separate 24V power supply is required (Danfoss Icon™ 24V Wireless only)
* Manual change over between cooling and heating
10 | Hydronic floor heating application guide
Floor heating system with hybrid Air/Water heat pump with
integrated condensing boiler (example: Itho Cool Cube).
Reference room control
Low temperature
Where to use:
Advantages:
1 and 2
family houses
ü ü ü
• Automatically changes to the relevant heat / cooling source
• Energy saving by setting a neutral time period
• Auto balancing function by Danfoss Icon™
HP
Multi family
houses
Reference
Thermostat
Light commercial
buildings
( , )
Components suitable for application:
Controls
Manifolds
Danfoss Link™
FHF-F FHF FH-ME FHF-B SSM-F SSM
ü ü ü ü ü ü
Balancing valve
AB-PM ASV-PV + ASV-BD
ü ü
Complementary product suitable for application:
• Cool Cube is required for this application
• Danfoss Icon Expansion module
• Dew point sensor
Danfoss Icon™
24V / Wireless
ü
Danfoss Icon™
230V
FH-Wx BacisPlus
heating.danfoss.com | 11
2
FHV
Floor heating system with automatic changeover for
cooling based on supply temperature.
Individual room control
Low temperature
Light commercial
buildings
Where to use:
1 and 2
family houses
ü ü ü
Multi family
houses
Advantages:
• Fixed or based on demand supply temperature control
• Automatic changing to heating or cooling based on demand
• Global away relay on expansion module can be used as remote control
• Auto balancing function by Danfoss Icon™
Components suitable for application:
Controls
Danfoss Link™
Danfoss Icon™
24V / Wireless
Danfoss Icon™
230V
FH-Wx BacisPlus
2
ü
Manifolds
FHF-F FHF FH-ME FHF-B SSM-F SSM
ü ü ü ü ü ü
Balancing valve
AB-PM ASV-PV + ASV-BD
ü ü
Complementary product suitable for application:
• Danfoss Icon™ Expansion module, dew point sensor and surface temperature sensor are required for Danfoss Icon™ 24V/Wireless
12 | Hydronic floor heating application guide
FHV
Mixed system
With self-acting room control
Where to use:
Advantages:
1 and 2
family houses
ü ü
• Individual room comfort and energy savings achieved by room thermostats
FHV-A
Multi family
houses
FHV-R
Components suitable for application:
Controls
Danfoss Link™
Danfoss Icon™
24V / Wireless
Danfoss Icon™
230V
FH-Wx BacisPlus
2
FHV
ü
Manifolds
FHF-F FHF FH-ME FHF-B SSM-F SSM
ü
Balancing valve
AB-PM ASV-PV + ASV-BD
ü ü
Complementary product suitable for application:
• In case of multi family houses, balancing valve AB-QM should be used
* Danfoss Icon™ 230 V and BasicPlus² can be combined with connection box to achieve energy savings on heat production and pump energy
with relays
heating.danfoss.com | 13
Floor heating system with individual room control
Low temperature and cooling in 3/4-pipe system
Where to use:
Advantages:
1 and 2
family houses
ü ü ü
• Individual room comfort and energy savings achieved by room thermostats
• Energy savings on heat production and pump energy with connection box relays
• Ensure correct flow to heating system on apartment level with balancing valves and manifold flow setting
• Use floor heating system for passive cooling
Multi family
houses
Light commercial
buildings
Components suitable for application:
Controls Danfoss Link™
Danfoss Icon™
24V / Wireless
ü ü
Manifolds FHF-F FHF FH-ME FHF-B SSM-F SSM
Danfoss Icon™
230V
(ü)*
FH-Wx BacisPlus
ü
(ü)*
2
ü ü ü ü
Balancing valve
AB-PM ASV-PV + ASV-BD
ü ü
Complementary product suitable for application:
• Remote controller CF-RC for configuration of system
• Dew point sensor CF-DS
* Only if differential pressure in the system is <1 bar. If differential pressure is higher please contact Danfoss.
FHV
14 | Hydronic floor heating application guide
Floor heating 3-pipe system with cooling controlled via
motorized valve. Reference room control
High and low temperature
Where to use:
Advantages:
1 and 2
family houses
ü ü ü
• Global away relay on expansion module can be used as remote control
• Automatic changing to heating or cooling ordered via reference thermostat
• Energy saving by setting a neutral time period
• Auto balancing function by Danfoss Icon™
Multi family
houses
Light commercial
buildings
Components suitable for application:
Controls
Danfoss Link™
Danfoss Icon™
24V / Wireless
ü
Manifolds
FHF-F FHF FH-ME FHF-B SSM-F SSM
ü ü ü ü ü ü
Balancing valve AB-PM ASV-PV + ASV-BD
ü ü
Complementary product suitable for application:
• Danfoss Icon™ Expansion module
• Dew point sensor
• 3-way valve (AMZ-113)
Danfoss Icon™
230V
FH-Wx BacisPlus
heating.danfoss.com | 15
2
FHV
Floor heating 4-pipe system with cooling controlled via
6-port valve, automatic changeover. Reference room control
High and Low temperature
Where to use:
Advantages:
1 and 2
family houses
ü ü ü
• Global away relay on expansion module can be used as remote control
• Automatic changing to heating or cooling ordered via reference thermostat
• Energy saving by setting a neutral time period
• Automatic shut-off function
Heating side
4-pipe riser
4-pipe riser
Cooling side
Multi family
houses
Reference
Thermostat
Light commercial
buildings
( , )
Components suitable for application:
Controls
Danfoss Link™
Danfoss Icon™
24V / Wireless
ü
Manifolds
FHF-F FHF FH-ME FHF-B SSM-F SSM
ü ü ü ü ü ü
Balancing valve AB-PM ASV-PV + ASV-BD
ü ü
Complementary product suitable for application:
• Danfoss Icon Expansion module
• Dew point sensor
• 6-port valve (003Z3155)
• 2-way valve (AMZ-112)
16 | Hydronic floor heating application guide
Danfoss Icon™
230V
FH-Wx BacisPlus
2
FHV
heating.danfoss.com | 17
quickplanner.danfoss.com
Easier application
specification
Online
Our online QuickPlanner dimensioning program
enables you to calculate the correct pre-setting
values in just minutes. Go online and have the
following information ready:
• Room sizes
• Heat requirement (W/m2)
• Supply temperature
• Desired room temperature
• Floor type
18 | Hydronic floor heating application guide
HOW TO DESIGN
EFFECTIVE
PIPE LAYOUT
Application guidelines for heating circuit layout.
The application guidelines provide you with basic application ideas
and recommendations on how to design effective layout patterns
for different rooms.
heating.danfoss.com | 19
heating.danfoss.com | 19
Meander pattern vs. snail pattern
+
+
–
–
Benefits
Meander pattern
• The meander pattern is easy to lay
• BasicRail™, BasicClip™ and BasicGrip™
systems can be used
• The meander pattern will distribute
heating less uniformly across the room.
In effect, some parts of the floor will be
warmer than others
Snail pattern
• Heating is equally distributed as supply
and return water runs adjacent. This
provides comfort compared to the
meander pattern.
• Requires more planning to lay
• Difficult to use BasicRail™
Pipe distance independent of pattern
type example:
Floor type: Wooden floor
Heat requirement: 40 W/m
Mean water temp.: 35 °C
Room temperature: 20 °C
= Pipe distance 200 mm CC
For information about your specific building,
please consult Danfoss.
2
20 | Hydronic floor heating application guide
Small windows vs. large windows
Pipe distance
Small or no windows
Smaller windows do not need to be taken
into account as the downdraft is limited.
Example:
Floor type: Tile floor
Heat requirement: 40 W/m
Mean water temp.: 35 °C
Room temperature: 20 °C
= Pipe distance 200 mm CC
2
For information about your specific building,
please consult Danfoss.
Large floor-to-ceiling window
At larger windows the pipe distance
must be reduced in order to account for
downdraft from the windows.
Example:
Floor type: Tile floor
Heat requirement: 92 W/m
(at the window)
Mean water temp.: 35 °C
Room temperature: 20 °C
= Pipe distance, window 120 mm CC
= Pipe distance, rest 200 mm CC
2
For information about your specific building,
please consult Danfoss.
heating.danfoss.com | 21
Bathroom and kitchen
Laying patterns and distance
Bathroom
Suggested snail pattern for a typical
bathroom. Due to the requirement for
higher temperatures in the bathroom, the
pipe distance should be reduced.
Example:
Floor type: Tile floor
Heat requirement: 67 W/m
(at the window)
Mean water temp.: 35 °C
Room temperature: 24 °C
= Pipe distance, window 120 mm CC
For information about your specific building,
please consult Danfoss.
2
Kitchen Appliance
Kitchen
Avoid placing pipes under the kitchen
cabinets. If pipes are placed under the
kitchen cabinets, the temperature in the
cabinets will increase which is not optimal
if they contain food.
Example:
Floor type: Wooden floor
Heat requirement: 40 W/m
Mean water temp.: 35 °C
Room temperature: 20 °C
= Pipe distance 200 mm CC
For information about your specific building,
please consult Danfoss.
2
22 | Hydronic floor heating application guide
Large rooms
Laying patterns and distance
Large rooms
Suggested snail pattern for a typical large
room.
Due to the size of the room the number
of circuits must be increased (in this
example to three circuits).
Example:
Floor type: Wooden floor
Heat requirement: 40 W/m
Mean water temp.: 35 °C
Room temperature: 20 °C
Number of circuits 3
= Pipe distance, window 120 mm CC
= Pipe distance, rest 200 mm CC
For information about your specific building,
please consult Danfoss.
2
heating.danfoss.com | 23
CHOOSING
THE RIGHT
FLOOR SCREED
Application guidelines for floor build-up.
Liquid and cement screed both ensure a smooth and even surface.
However, the two types of screed each have different benefits and
impact on floor thickness and weight.
24 | Hidronik döşemeden ısıtma uygulama kılavuzu
24 | Hydronic floor heating application guide
+
–
Liquid screed vs. cement screed
Benefits and impact
Liquid screed
• Floor thickness reduced compared to cement screed
• Floor weight reduced compared to cement screed
• Reducing thickness and weight can be important in e.g. renovations
• Liquid screed is often more expensive
Carpet / tiles / parquet
Screed
Perimeter
insulation
FH composite / FH PE-RT pipe (16 mm)
Liquid * Cement
Screed thickness [mm] 65 85
Insulation thickness [mm] 35 35
Construction height [mm] 100 120 Height excluding floor finish
Weight [Kg/m2] 140 176 Weight excluding floor finish
Thermal resistance (R) [m2K/W] 0.87 0.87 Thermal resistance value for floor heating panel
Panel with insulation
Thermal transmission coefficient (U) [W/m2K] 0.96 0.96 Check building regulation for thermal insulation requirement
Distribution load [kN/mm2] <2.0 <2.0
Point load (>20 cm2) [kN] <2.0 <2.0
Impact subsonic noise reduction [dB] 28 28
* Example based on cement screed with CAF F5 additive. Using other CAF additives will impact thickness and weight.
Calculated value according to DIN 4109. Applies to concrete
slabs thicker than 12 cm (DIN 4109; m2 > 276 kg/m2)
heating.danfoss.com | 25
Pioneering heating controls
for decades
Danfoss has been designing and developing heating control systems for more
than 80 years. Throughout that time, it has been our goal to continuously innovate,
perfect and refine cutting-edge heating and cooling solutions.
First sales of built-in
valves (used in floor
heating manifolds)
1943 1982 1996 1998 2002 2005 2007 2011 2017
Mads Clausen designs
the world’s first radiator
thermostat
World’s first wireless
room control for floor
heating introduced
First manifold with
Danfoss built-in valves
Danfoss acquires
PentaCom floor heating
and launches its own TWA
CF2 wireless room
controls introduced
with infrared sensor
Danfoss acquires
Jupiter floor heating
Launch of Danfoss Link™
floor heating and
radiator thermostat
Launch of Danfoss Icon™
230 V Floor Heating
Controls
© Danfoss | FEC | 2021.07
AB179586476913en-020402
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