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Cast iron atmospheric boiler

Gas fired, central heating only, electronic ignition

Domus IN: open flue
Domus ISN: room sealed

High efficiency cast iron boilers designed for central heating, with low running costs and reduced emissions. Available in a natural open flue version and room sealed version. The open flue version is supplied with a brand new high performance combustion unit. Automatic ignition system supplied with atmospheric burner. LPG conversion kit supplied as standard.

Product advantages

  • Innovative stylish design, for installation even in domestic rooms like kitchens, washrooms and utility rooms.
  • New, stylish, and user friendly control panel.
  • Optional Riello Esatto digital temperature control system to be fitted on the control panel with pressure gauge. Multi-zone central heating kit (up to a maximum of three zones) available as optional.
  • Boilers can be connected to a Riello ATRB 120 DHW calorifier (or equivalent) and to a temperature control system using the relevant kits.

Installation/maintenance advantages

  • Easy inspection of the flue and of the air box in room sealed versions.
  • In room sealed versions, the air box is fitted with combustion control sockets as standard.
  • Front access to the control panel with removable electrical terminal block.
  • Index of protection of control panel IP X0D (IP 40).

Characteristics Domus
24 IN Domus
31 IN Domus
31 ISN

Input kW 26,6 34,4 34,86

Mcal/h 22,9 22,9 22,9

Output kW 24 31,0 31,7

Mcal/h 20,6 26,7 27,25

Efficiency at max output % 90,23 90,12 90,9

Efficiency at power 30% output % 87,8 89,0 93

Heat losses through flue gas burner lockout % 0,36 0,37 0,3

Heat losses through flue gas 100 % load % 7 7,1 6,25

Heat losses through insulation burner lockout % 1,29 1,0 0,51

Heat losses through insulation 100% load % 2,77 2,78 2,85

Flue gas temperature oC ~110 ~120 ~130

CO2 % 5,6 5,7 8,4

CO less than ppm 21 21 43

NOx (*) mg/kWh <260 <260 <260

Water-side pressure drop @ (Δt 100C) mbar 66 110 115

Pa 6600 110000 11500

Water-side pressure drop @ (Δt 15oC) mbar 29 49 51

Pa 2900 4900 5100

Water-side pressure drop @ (Δt 20oC) mbar 16 28 29

Pa 1600 2800 2900

Maximum flow temperature oC 100 100 100

Boiler capacity l 9 10,6 17

Expansion vessel capacity l - - -

Boiler maximum working pressure bar 3 3 3

kPa 300 300 300

Power supply V/50 Hz 230 230 230

Power input W 15 15 65

Index of protection IP XOD(40) XOD(40) XOD(40)

Net Weight kg 100 118 143

* EN 297

Dimensions (mm)

Domus IN

Domus ISN

Models 24 IN 31 IN 31 ISN

L - Width mm 450 450 450

A - Overall Length mm 697 697 632

P - Length mm 665 665 600

H - Boiler height mm 850 850 850

C mm 144 154 167

Hydraulic circuit

Domus IN

Key

1   CH drain
RI CH return
G  Gas mains
MI CH flow

Domus ISN

Key

1   CH drain
RI CH return
MI CH flow
G   Gas mains

Water connections

Domus IN

Description 24 IN 31 IN

A mm 64 28

MI CH flow Ø 3/4” (M) 3/4” (M)

RI CH return Ø 3/4” (M) 3/4” (M)

CI CH system filling loop Ø - -

AB Calorifier connection Ø - -

G Gas mains Ø 1/2” (M) 1/2” (M)

B mm 50 28

Domus ISN

Description 31 ISN

MI CH flow Ø 3/4” M

RI CH return Ø 3/4” M

CI CH system filling loop Ø -

AB Storage cylinder connection Ø -

G Gas mains Ø 1/2” M

Pump/water-side pressure drop

Domus IN – ISN boilers are supplied without a pump. A pump must therefore be provided as part of the installation.

Control Panels

Key

  1. System temperature gauge (IN-ISN)
  2. Function selector
    1. Boiler off
    2. Boiler on
    3. Reset (electronic flame control system reset
    4. Automatic mode selector (*)
  3. Boiler thermostat
  4. Manual reset for high limit thermostat
  5. Electrical power indicator (green)
  6. Burner lockout (red)
  7. Function indicators

(*) For use only if a temperature control kit is installed.

Riello Domus IN

Description for summary specifications

High efficiency, floor standing hot water boiler, manufactured from cast iron elements. Natural open flue combustion chamber with stainless steel, stabilised flame atmospheric natural gas burner with automatic ignition.

Maximum working pressure is 3 bar.

Description for specifications

These B11BS type, class II 2H3+ hot water boiler includes:

  • Light grey steel external casing panels, assembled with quick fit couplings, removable for servicing
  • high density fibre-glass wool lagging , protected by aluminium sheet
  • boiler body manufactured from sectional cast iron elements
  • low pressure drop combustion chamber designed to generate a highly turbulent motion to generate an efficient gas to water heat transfer and high efficiency
  • stainless steel, stabilised flame, multijet atmospheric burner
  • electronic ignition system with ionisation flame detection
  • instrument panel protected by a hinged cover to prevent accidental tampering, housing all control devices, including main switch, electrical power, flue and burner lockout indicators and the socket
  • control thermostat and boiler high limit thermostat with manual reset, connected to separate lines
  • boiler water temperature gauge
  • gas valve group including the safety valve, control valve, gas pressure regulator and filter
  • rear draught diverter with vertical exhaust outlet
  • manual reset exhaust thermostat
  • system reset on control panel
  • main on-off switch
  • instrumentation fitting
  • maximum working pressure 3 bar
  • compliant with CEI standards
  • index of protection IP40
  • compliant with 90/396/EEC directive (gas – CE marking)
  • compliant with 89/336/EEC directive (electromagnetic compatibility)
  • compliant with 72/23/EEC directive (low voltage)
  • compliant with 92/42/EEC directive (efficiency)

Material supplied

  •  L.P.G. kit
  • gas mains cock
  • installation, operation and maintenance manual
  • hydraulic certificate
  • product identification plate

Riello Domus ISN

Description for summary specifications

High efficiency, floor standing hot water boiler, manufactured from cast iron elements. Room Sealed Combustion Chamber with stainless steel, stabilised flame atmospheric natural gas burner with automatic ignition.

Maximum working pressure is 3 bar.

Description for specifications

These C12 – C32 – C42 – C52 type, class II 2H3+ hot water generators comprise:

  • Light grey steel external casing panels, assembled with quick fit couplings, removable for servicing .
  • high density fibre-glass wool lagging , protected by aluminium sheet
  • boiler body manufactured from sectional cast iron elements
  • low pressure drop combustion chamber designed to generate a highly turbulent motion to generate an efficient gas to water heat transfer for higher efficiency
  • stainless steel, stabilised flame, multijet atmospheric burner
  • electronic ignition system with ionisation flame detection
  • instrument panel protected by a hinged cover to prevent accidental tampering, housing all control devices, including main switch, electrical power and burner lockout indicators and socket
  • control thermostat and boiler high limit thermostat with manual reset, connected to separate lines
  • boiler temperature gauge
  • gas valve group including the safety valve, control valve, gas pressure regulator and filter
  • flue gas air pressure switch
  • air box with two pressure switch fittings, one for air inlet test and one for flue gases analyzer
  • CH drain cock
  • main on-off switch
  • instrumentation fittings
  • maximum working pressure 3 bar
  • compliant with CEI standards
  • index of protection IP40
  • compliant with 90/396/EEC directive (gas – CE marking)
  • compliant with 89/336/EEC directive (electromagnetic compatibility)
  • compliant with 72/23/EEC directive (low voltage)
  • compliant with 92/42/EEC directive (efficiency)

Material supplied

  • L.P.G. nozzle pack
  • gas mains cock
  • installation, operation and maintenance manual
  • hydraulic test certificate
  • product identification plate