LAARS® NEOTHERM®

LAARS® NEOTHERM®

High EfficiencyCommercial Modulating,

Condensing Boilers

PACKED WITH FEATURES• Large Color Touch Screen

• Less Than10ppm NOx

• Up to 96.6% Thermal Efficiency

• 6 Models 285 to 850 MBH

• Vent up to 100 feet, horizontal or vertical

• Zero clearance to combustibles for tight installations

Efficiency Data

AFUE %

95.0

N/A

N/A

N/A

N/A

N/A

285

399

500

600

750

850

N/A

96.5

95.0

95.3

96.6

95.7

ThermalEfficiency %

N/A

96.5

95.0

96.0

96.6

95.7

CombustionEfficiency %

285,000

399,900

500,000

600,000

750,000

850,000

83.5

117.2

146.4

175.7

219.8

248.9

264,000

386,000

475,000

572,000

724,000

813,000

77.4

113.1

139.2

167.6

212.1

238.2

11/2"11/2"11/2"11/2"2"2"

3/4"3/4"1"1"

11/2"11/2"

136

165

190

193

218

228

299

364

419

426

481

503

InputBTU/h kW

OutputBTU/h kW

Connection Size (NPT)ShippingWeight

Water Gas lbs. kgSize

LAARS® NEOTHERM

®

HYDRONIC BOILER

Standard Equipment:• High condensing efficiency• Modulation down to 20% of full fire

(5:1 turndown)• Sealed combustion chamber• Stainless Steel Heat Exchanger• Pre-mix stainless steel burner• Low NOx system (10ppm) exceeds

the most stringent regulations for air quality

• Horizontal or vertical direct vent• Horizontal vent and air terminals• Vent and air pipe lengths of up to

100 equivalent feet (each)• Built-in condensate trap• Vent temperature cutoff feature

• Integrates with Building Automation Systems

• Spark ignition system• 160 psi maximum working pressure• Stainless steel heat exchanger with

welded construction (no gaskets)• ASME “H” stamp• 75 psi (517 kPa) ASME rated

pressure relief valve• Temperature & pressure gauge• Drain valve• Multiple pump control for boiler

pump, system pump and indirect domestic water pump, each with delay

• Connections from top of unit• ENERGY STAR® for 285 size only

• Electronic PID modulating control• Large color touch screen• Alarm output• Accepts external 4-20mA

modulation control (0-10V optional)• Indirect water heater priority

with sensor• Outdoor reset with sensor• On/off toggle switch• Manual reset high limit• Burner sight glass• Zero clearance to combustible

surfaces for alcove and closet installations

• 10 year limited warranty

LAARS® NEOTHERM®

Hydronic BoilerNeoTherm is a direct vent, sealed combustion, condensing boiler with thermal efficiency as high as 96.6% that modulates with a 5 to 1 turndown. The boiler features an ASME stainless steel heat exchanger, boiler pump (size 285 only, sizes 399-500 optional) and low NOx emissions (10 ppm NOx), for a package that’s easy to use and easy on the environment.

NeoTherm is built standard with the upgraded LAARS Integrated Control System that puts the ignition control, temperature control and high limit in one user-friendly device that does it all with an easy to use, large color touch screen interface.

The PID control system has outdoor reset and indirect water heater priority, frost protection, and loads of other features. It seamlessly integrates with building automation systems and can easily become part of multiple boiler sequencing, including a cascading feature that rotates load across up to eight NeoTherms to optimize boiler life without the need for additional system controls.

Available for natural or propane gas, with a selection of factory mounted options, and 6 sizes ranging from 285 to 850 MBH, these indoor models are suitable for a broad variety of residential and commercial applications.

• Large, easy to navigate color touch screen

• Easy to use menus for login, quick start, advanced setup, tests and diagnostics

• Integrated PID temperature and ignition control

• Accepts 4-10mA or 0-10VDC input for modulation

• Lead Lag with up to 8 other NeoTherm boilers

• Quick start feature for easy one boiler setups

• Outdoor reset with customizable reset curves, DHW override and warm weather shutdown

• Complete diagnostics for analog and digital inputs

• Test feature allows for forced min and max firing

• Display holds, alerts and errors in clear text form

• Password protected parameters for installer use

NEOTHERM INTEGRATED CONTROLS FEATURES:

Dimensions are nominal.*NeoTherm is shipped with adapters for the air and vent.

285

399

500

600

750

850

25

25

25

25

25

25

64

64

64

64

64

64

WSize in. cm

263/4311/2373/4373/451

551/4

68

80

96

96

130

130

Lin. cm

201/425

301/4293/4351/2393/4

52

64

77

76

90

101

Ain. cm

71/451/451/45

6

6

19

13

13

13

15

15

Bin. cm

193/4193/4193/4191/2191/2191/2

41/441/441/441/451/451/4

111/4143/4151/215

19

19

131/2181/220

20

401/2443/4

14

191/4201/2

3

31/431/2

381/4381/4381/4381/4381/4381/4

15

161/219

19

19

19

17

213/426

26

303/435

183/4183/4183/4183/4183/4183/4

13

13

13

81/481/481/4

50

50

50

50

50

50

Cin. cm

11

11

11

11

13

13

Din. cm

29

37

38

38

48

48

Ein. cm

34

47

51

51

103

114

Fin. cm

36

49

52

8

8

9

Gin. cm

97

97

97

97

97

97

Hin. cm

38

42

48

48

48

48

Jin. cm

43

55

66

66

78

89

Kin. cm

48

48

48

48

48

48

Min. cm

33

33

33

21

21

21

Nin. cm

41/241/241/241/241/241/2

11

11

11

11

11

11

Air Inlet*in. cm

41/241/241/241/261/261/2

11

11

11

11

17

17

Vent*in. cm

Setpoints

23.75v4-20mA

OPENDHW

121˚FOutlet

72˚F

Demand Central Heat Firing Rate 100%

Setpoint 160˚F

Burner State Run

Inlet

Modulation

Demand rate

Limited rate

Override rate

Diagnostics DetailsOperationConfigure

Alert 228 Warm weather shutdown was not checked due to invalid outdoor temperature.

100%

NIone

None

136˚FStack

LOCALOutdoorOPEN

Flame

Dimensional Data

Efficiency Data

AFUE %

95.0

N/A

N/A

N/A

N/A

N/A

285

399

500

600

750

850

N/A

96.5

95.0

95.3

96.6

95.7

ThermalEfficiency %

N/A

96.5

95.0

96.0

96.6

95.7

CombustionEfficiency %

285,000

399,900

500,000

600,000

750,000

850,000

83.5

117.2

146.4

175.7

219.8

248.9

264,000

386,000

475,000

572,000

724,000

813,000

77.4

113.1

139.2

167.6

212.1

238.2

11/2"11/2"11/2"11/2"2"2"

3/4"3/4"1"1"

11/2"11/2"

136

165

190

193

218

228

299

364

419

426

481

503

InputBTU/h kW

OutputBTU/h kW

Connection Size (NPT)ShippingWeight

Water Gas lbs. kgSize

LAARS® NEOTHERM

®

HYDRONIC BOILER

Standard Equipment:• High condensing efficiency• Modulation down to 20% of full fire

(5:1 turndown)• Sealed combustion chamber• Stainless Steel Heat Exchanger• Pre-mix stainless steel burner• Low NOx system (10ppm) exceeds

the most stringent regulations for air quality

• Horizontal or vertical direct vent• Horizontal vent and air terminals• Vent and air pipe lengths of up to

100 equivalent feet (each)• Built-in condensate trap• Vent temperature cutoff feature

• Integrates with Building Automation Systems

• Spark ignition system• 160 psi maximum working pressure• Stainless steel heat exchanger with

welded construction (no gaskets)• ASME “H” stamp• 75 psi (517 kPa) ASME rated

pressure relief valve• Temperature & pressure gauge• Drain valve• Multiple pump control for boiler

pump, system pump and indirect domestic water pump, each with delay

• Connections from top of unit• ENERGY STAR® for 285 size only

• Electronic PID modulating control• Large color touch screen• Alarm output• Accepts external 4-20mA

modulation control (0-10V optional)• Indirect water heater priority

with sensor• Outdoor reset with sensor• On/off toggle switch• Manual reset high limit• Burner sight glass• Zero clearance to combustible

surfaces for alcove and closet installations

• 10 year limited warranty

LAARS® NEOTHERM®

Hydronic BoilerNeoTherm is a direct vent, sealed combustion, condensing boiler with thermal efficiency as high as 96.6% that modulates with a 5 to 1 turndown. The boiler features an ASME stainless steel heat exchanger, boiler pump (size 285 only, sizes 399-500 optional) and low NOx emissions (10 ppm NOx), for a package that’s easy to use and easy on the environment.

NeoTherm is built standard with the upgraded LAARS Integrated Control System that puts the ignition control, temperature control and high limit in one user-friendly device that does it all with an easy to use, large color touch screen interface.

The PID control system has outdoor reset and indirect water heater priority, frost protection, and loads of other features. It seamlessly integrates with building automation systems and can easily become part of multiple boiler sequencing, including a cascading feature that rotates load across up to eight NeoTherms to optimize boiler life without the need for additional system controls.

Available for natural or propane gas, with a selection of factory mounted options, and 6 sizes ranging from 285 to 850 MBH, these indoor models are suitable for a broad variety of residential and commercial applications.

• Large, easy to navigate color touch screen

• Easy to use menus for login, quick start, advanced setup, tests and diagnostics

• Integrated PID temperature and ignition control

• Accepts 4-10mA or 0-10VDC input for modulation

• Lead Lag with up to 8 other NeoTherm boilers

• Quick start feature for easy one boiler setups

• Outdoor reset with customizable reset curves, DHW override and warm weather shutdown

• Complete diagnostics for analog and digital inputs

• Test feature allows for forced min and max firing

• Display holds, alerts and errors in clear text form

• Password protected parameters for installer use

NEOTHERM INTEGRATED CONTROLS FEATURES:

Dimensions are nominal.*NeoTherm is shipped with adapters for the air and vent.

285

399

500

600

750

850

25

25

25

25

25

25

64

64

64

64

64

64

WSize in. cm

263/4311/2373/4373/451

551/4

68

80

96

96

130

130

Lin. cm

201/425

301/4293/4351/2393/4

52

64

77

76

90

101

Ain. cm

71/451/451/45

6

6

19

13

13

13

15

15

Bin. cm

193/4193/4193/4191/2191/2191/2

41/441/441/441/451/451/4

111/4143/4151/215

19

19

131/2181/220

20

401/2443/4

14

191/4201/2

3

31/431/2

381/4381/4381/4381/4381/4381/4

15

161/219

19

19

19

17

213/426

26

303/435

183/4183/4183/4183/4183/4183/4

13

13

13

81/481/481/4

50

50

50

50

50

50

Cin. cm

11

11

11

11

13

13

Din. cm

29

37

38

38

48

48

Ein. cm

34

47

51

51

103

114

Fin. cm

36

49

52

8

8

9

Gin. cm

97

97

97

97

97

97

Hin. cm

38

42

48

48

48

48

Jin. cm

43

55

66

66

78

89

Kin. cm

48

48

48

48

48

48

Min. cm

33

33

33

21

21

21

Nin. cm

41/241/241/241/241/241/2

11

11

11

11

11

11

Air Inlet*in. cm

41/241/241/241/261/261/2

11

11

11

11

17

17

Vent*in. cm

Setpoints

23.75v4-20mA

OPENDHW

121˚FOutlet

72˚F

Demand Central Heat Firing Rate 100%

Setpoint 160˚F

Burner State Run

Inlet

Modulation

Demand rate

Limited rate

Override rate

Diagnostics DetailsOperationConfigure

Alert 228 Warm weather shutdown was not checked due to invalid outdoor temperature.

100%

NIone

None

136˚FStack

LOCALOutdoorOPEN

Flame

Dimensional Data

Customer Service and Product Support: 800.900.9276 • Fax 800.559.1583Headquarters: 20 Industrial Way, Rochester, NH 03867 • 603.335.6300 • Fax 603.335.33559 Brigden Gate, Halton Hills, Ontario, Canada, L7G 0A3 • 905.203.0600 • Fax 905.636.0666

www.LAARS.com Litho in U.S.A. © Laars Heating Systems Co. 1506 Document 1215l

A S M E

H

View our entire product line at www.Laars.com