Designing of radiant heating floor and wall installation

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Product InstalSystem 5
Source for translation IS 5.0 Beta 30

Scope of lesson

This article presents the method of designing radiant heating systems in loop arrangements (dry and wet).
The example shown is based on a design for a single-family two-storey house with no basement.

Modules and program configuration

The InstalSystem 5 includes the following module:

  • Radiant systems.

Inital state

The project includes a complete set of default data defined in a template.
The rooms arangement was based on base drawings in DWG format. More details in: Table of project example.

Steps to perform

Open new project file

  1. Launch InstalSystem 5.
  2. Open a new project and choose the preferred file version.
    For more information, see: Project and application management
  3. Select the appropriate template.
    For more information, see: Template files

Define catalogues and general data

Declare General data in default data:

  1. Storeys management - add the required number of storeys
    For more information, see: Preparation of building structure
  2. Catalogues - choose catalogues according to the list in the Project table with regard to:
    • Radiant systems
    • Pipes and pipe fittings
    • Insulation
    • Valves and fittings
  3. Thermal systems - append information for:
    • Distribution system
      • Types and default data
    • Radiant systems
      • Floor systems
      • Wall systems
      • Manifolds, fittings and control

For more information, see: Using catalogs and catalogs data in the project

Project files

How to calculate downloaded file?

Floor and wall radiant heating system in single-family house, isproj
Designed with InstalSystem 5 Rev. Beta 30
Required modules InstalSystem basis
Heating system 5
Radiant loop systems 5
Project range Radiant heating
Used catalogues

Basic radiant systems
Brass and steel pipe couplings and fittings
Copper pipes and fittings EN 1057
Standard mixers, pump and bypass units
Standard insulation catalogue
Neutral valves catalogue - typical construction

Type of building single-family
no basement
Building structure Base drawing ground floor, dwg
Base drawing first floor, dwg
Drawings range Plan view
Prepared by Logo-instalsoft-new.png
Legal disclaimer Copying of entire project and of its fragments allowed
Calculation results Full printout, xls
Full printout, pdf
Radiant heating calculation results, pdf
Bill of materials, pdf
Installation parameters, pdf
Drawing results Ground floor, dwg
First floor, dwg
Ground floor, pdf
First floor, pdf

Prepare building structure

  1. Import, rescale and arrange in relation to each other, by inserting Reference point, base drawings for each storey.
    For more information, see: Import files
  2. Redraw rooms in the rescaled base drawing using the AUTO mode.
    For more information, see: Insert rooms
  3. Automatically number the rooms using the Symbols assignment function. Start from the room in the upper left corner of each storey.
  4. Make appropriate corrections in Data table:
    • Design temperature: enter 24°C for bathrooms, 16°C for lobby.
    • Maximum permissible floor surface temperature by selecting appropriate room type in the Heating section.
    • For unheated rooms, specify the value of heat loss index as "0".
      For more information, see: Setting up the building structure
  5. Verify the correctness of the structure entered in 3D view.
    For more information, see: Preparation of building structure

Edit installation - radiant system

Heating/Cooling Zone

  1. Insert Heating/Cooling Zone components in selected rooms.
    1. Inserting Heating/Cooling Zone

  2. Cut out appropriate fragments of: Heating/Cooling Zone and/or change their shapes to adapt them to occupied areas (stairs, bathtubs) in rooms.
  3. Divide selected areas of Heating/Cooling Zone with regard to required expansion allowances.
  4. Declare and set up the Peripheral zone (PZ).
    For more information, see: Dividing a Heating/Cooling Zone


  1. Insert Manifold on every storey. Manifold is inserted in the drawing together with manifold cabinet.
    For more information, see: Manifold and accessories
2. Inserting Manifold

Pipe feeds route

  1. Connect Heating/Cooling Zone with manifolds using Pipe feeds route. Pipe feeds route enables automatic generation of pipe feeds.
    For more information, see: Editing pipe feeds in a radiant system
3. Inserting Pipe feeds route

Edit installation - feed to manifolds


  1. Insert Source on the lowermost storey.
    4. Inserting Source


  1. Insert Riser, assign a symbol to it and define its extent (from storey 0 to storey 1).
    For more information, see: Connecting storeys with the "Stack" element
    5. Inserting Riser


  1. Connect Source, Manifold, Riser with each other by drawing the network using the Pipe-run component and the AUTO and ORTO modes.
    6. Connecting system components


  1. Insert Valve onto pipe-runs.
    7. Inserting Fittings

  2. Select Valve type in Data table.
    8. Valve type

  3. Use Copy - Paste to insert fittings of the same type onto other pipe-runs.

Verify correctness of installation structure

  1. Verify the correctness of the installation structure using the Check connections function (Key shortcut: Shift + F2).
  2. Verify the correctness of the installation structure and find conflicts using 3D view.
    For more information, see: Verification of the correctness of installation structure

Edit installation components data


  1. Mark selected Heating/Cooling Zone components and specify the type of Covering.
    9. Covering

Heating/Cooling Zone

  1. Mark these Heating/Cooling Zones where significant surface area is occupied by pipe feeds and change their type to Heated/cooled by pipe feeds. Remember in this case to remove connections with the manifold.
  2. Mark these Heating/Cooling Zones where no loops are to be arranged and change their type to Without pipes.
    10. Type Heating/Cooling Zone

Calculations and diagnostics

Radiant system calculations

  1. Launch complete calculations by clicking the Calculator.png icon in the Calculations section of the toolbar.
  2. Open the Diagnostics window by selecting it in the list of windows or by pressing F8.
  3. After calculations are completed verify the messages listed in the Diagnostics window. If error messages are displayed, these must be eliminated in the first place.

For more information, see: Calculations and diagnostics

Modifying system parameters to adapt attained output to required output

  1. Change feed temperature of the radiant system by using control circuits, which can be found in General data window in Thermal systems/Sources section.
    11. Control circuits

  2. Change pipe spacing and temperature drop in individual loops.
    12. Interactive radiant systems calculations

    13. Interactive radiant systems calculations

  3. Change structure of heating floor\wall.
    14. Floor build-up ...

  4. Change Max. press. drop in circuit.
    15. Max. press. drop in circuit

Modifying the dividing line of element Heating/Cooling Zone to elements Heating-cooling surface

For more information, see: Modifying the dividing line after automatic division

Manual correction of automatically generated pipe feeds route

For more information, see: Pipe feeds route - manual correction of automatically generated pipe feeds route

Appending drawings with radiant system loops

For more information, see: Appending drawings with radiant system loops

Including of drawing loop lenght in the calculations

For more information, see: How to include the drawing loop lenght in the calculations?

Using of plates in dry floor heating system

For more information, see: Inserting plates in dry floor heating system

Recalculation and verification of results

  1. Verify calculation results paying special attention to:
    • coverage of heat demand in rooms,
      16. Coverage of required heating output

    • sized layers in Heating/cooling floor, to see if there are no undesirable differences in height/thickness in adjacent areas.
      17. Floor build-up ...

    • bills of materials.
      18. Bill of materials - heating / cooling - List of radiant heating components

Prepare drawing for printing/export


  1. Insert required labels onto components.
  2. Configure the label appearance (opc).
    For more information, see: Item 5. Component appearance configuration and editing parameters configuration
    19. Inserting Label

Manifold table

  1. Insert Manifold table.
    For more information, see: Manifold label and table

Structure cross section drawing

  1. Insert Structure cross section drawing. Rescale and configure, if necessary.
    20. Structure cross section drawing

RHC loop

  1. Automatically generate the RHC loop drawings.
    For more information, see: Automatic generation of loop drawings
  2. Check the generated RHC loop drawings and modify them manually, if necessary.
    For more information, see: Manual editing of loop drawings

Drawing frame

  1. Insert Drawing frame.
  2. Select Drawing frame in Data table .
    21. Inserting Drawing frame

Drawing chart

  1. Insert Drawing chart.
  2. Enter the required data in Data table.
    22.Drawing chart

Print/export results

  1. Print/export drawings.
  2. Print/export tables.
    For more information, see: Export / print results and drawings