MWH 180
Tankless Water Heater

NOW

IN STOCK!

MWH 180 Series, Tankless Water Heaters from Monitor Products, Inc.
The most advanced, tankless, continuous water heaters available


The MWH 180 series tankless gas water heaters are 83% efficient. On demand tankless gas water heaters provide a continuous
supply of hot water; only heating the water needed, cutting water heating costs up to 50%.

The compact design of the MWH 180 for interior installation tankless water heater allows for installation virtually anywhere.

  • New advanced technology, supplying hot water continuously at published flow rates with a preset temperature of 120° F
  • Includes main remote control, additional remote available for enhanced performance
  • Crisp, modern design to blend in any decor
  • Built in signal notifies the microprocessor to start the burner operation when the faucet is open and to stop when closed
  • Gas is only consumed when water is heating
  • Energy efficient electronic ignition system grants significant savings in energy and money
  • Advanced control system uses sensors to maintain a constant outgoing water temperature
  • For added safety the microprocessor limits the maximum temperature of the hot water to 120° when not using the remote control
  • Service codes are displayed on a remote control speeding diagnostics during maintenance calls.
  • Designed to prevent varying temperature of hot water when the faucet is cycled on and off, quick response mode
    for rapid heating
  • Mounts easily to the wall requiring limited wall and no floor space
  • Endless loop in input and output control ensures a stable flow of hot water
  • Rich, lean design of the burner produces minimum nitrous oxides
  • Potted control circuit board provides greater reliability of electronic components
MWH 180 Interior Unit Performance Specifications

Model

 
Maximum
Minimum
Gas Consumption
Natural Gas
180,000 Btuh
20,000 Btuh
LPG
180,000 Btuh
20,000 Btuh
Gas Supply Pressure
Natural Gas
10.5" w.c.
4" w.c.
LPG
14" w.c.
8" w.c.
Manifold Gas Pressure
Natural Gas
2.4" w.c.
0.4" w.c.
LPG
2.4" w.c.
0.4" w.c.
Hot Water Capacity 
0.58-5.8 gpm
Max. Hot Water Capacity (54° F rise)
5.8 gpm
Approved gas type:
Natural or Propane
Exhaust System:
MWH 180 Direct Vent Forced Combustion
Dimensions:
24-1/32" High (610 mm)
3-25/32" Wide (350 mm)
8-38" Deep (210 mm)
weight: 43 lb.
Installation:
Interior only/wall hung
Connections:
Gas: 3/4" MNPT
Water Inlet: 3/4" MNPT
Hot Water Outlet: 3/4" MNPT

Ignition System:
Direct Electronic Ignition

Set Point Temperature
(without remote):

Factory setting: 120° F
Flow Rate: .58 - 5.8 GPM
Temperature Range (with remote):
Remote Controller: 96° F - 140° F
Type of Appliance:
Gas continuous flow water heater
Electrical consumption:
Normal: 61 watts
Standby: 3.7 watts
Anti-frost operation: 84 watts
Recommended Minimum Water Supply Pressure:
15 psi (recommended 25-75 psi for maximum performance)
Maximum water supply pressure:
150 psi

Compare Monitor MWH180 to RINNAI R75LSi
Components
Monitor MWH180
RINNAI R75LSi
Gas Input
20,000-180,000 Btu/h
15,000-180,000 Btu/h
Max. Hot Water Capacity
5.8 GPM ( 54° rise)
5.5 GPM (55° rise)
Temperature Setting
15PSI (Recommended 25-75 PSI)
20 PSI (Recommended 50 PSI or above)
Power Consumption
96 - 140°
98 - 140°
Noise Level
49dB
49dB
Size & Weight
24-1/32"H x 13-25/32"W x 8-3/8"D
43 lbs.
25" H x 14" W x 10" D
50 lbs.
Warranty
12 years (Heat exchanger)
1 year (Reasonable labor)
12 years (Heat exchanger)
1 year (Reasonable labor)

Accessories
Safety Devices

MWH 180 Series
Remote Controller

MWH 180 Interior Unit
Clearance from Combustibles
Appliance AC120V - 60Hz
Remote control DC12V (digital)
CMR-2250
Supplied with Each Unit
(Main control Kitchen/laundry)
Part No. 3748
Top of heater 12"
Front of heater 6"
Sides of heater 2"
Flame failure - Flame rod Back of heater 0"
Over heat switch 212° F
YST-2250
Optional
(Bathroom control)
Part No. 3749
Floor 12"
Over heat limit 203° F Vent/air intake 0"
Thermal fuse 363° F     
Automatic frost protection
Non-polarized
two core cable
Combustion fan rpm check - PCB
Over current - fuse (5 amp)
Stocked MWH 180 Components
PartNo. Description
11180 Tankless Water Heater LP MWHLP
11180 Tankless Water Heater NG MWHNG
3705 Gas Connection
3706 Gas Control Assembly
3707 Combustion Fan Motor Assembly
3708 Transformer
3711 Water Filter and Drain Flug
3713 Water Flow Sensor
3714 Surge Protector
3716 Water Flow Control Device
3717 Igniter
3718 Thermister
3719 Over Heat Switch
3720 Thermal Fuse Harness
3721LP PCB Propane Gas
3721NG PCB Natural Gas
3722LP Manifold Assembly LP
3722NG Manifold Assembly NG
3724LP Damper LP
3724NG Damper NG
3725 Anti Frost Heater
3728 Electrode Packing
3729 Electrode
3730 Flame Rod
3732 Frost Sensing Switch
3734 Heat Exchanger Thermistor
3748 Main Remote Control
3749 Bath Remote Control
3755 O-Ring P4 Fluorine
3756 O-Ring P16 EPDM
3757 O-Ring P15 EPDM
3758 O-Ring P4 EPDM
3759 O-Ring P12 EPDM
3760 O-Ring P8
3761 O-Ring P24 NBR
3762 PCB Fuse
3763 Surge Protector Fuse
3801 Straight Pipe 11.8" FFTP300
3802 Straight Pipe 23.6" FFTP600
3803 Straight Pipe 35.4" FFTP900
3804 Adjustable Pipe 6.9-9.1" FFTA200
3805 Adjustable Pipe 8.2-12.2" FFTA260
3806 Elbow 45 degree FFTEL45
3807 Elbow 90 degree FFTEL90
3808 Male-Male Adapter FFTMM
3809 Horizontal Drain Tee FFTDP
3810 Straight Termination 3.9-9.8" FFT-7U-200
3811 Straight Termination 9.8-17.7" FFT-74-300
3812 Straight Termination 17.1-25.6" FFT-7U-500
3813 L Termination 3.9-9.8" FFT-7U(L)200
3814 L Termination 9.8-17.7" FFT-7U(L)-300
3815 L Termination 17.7-25.6" FFT-7U(;L)500
3816 Reducer FFTRD
3819 Support Strap 2" Clearance FFTSTR
9015 L50.12534 Flow Switch