Aqua-Hot 100 Series User manual

Use and Care Guide
100Series
AHE-125-GN1

Journey in Comfort
©Aqua-Hot® 125-GN1 Use and Care Guide
p. 1
Thank you for equipping your RV, coach, or caravan with an Aqua-Hot hydronic heating
system! We deeply value your business and we are grateful for the trust you have placed with
Aqua-Hot Heating Systems, LLC. Our customers are our top priority and we are committed to
providing best-in-class products, service, and support.
We understand how important comfort is to you as a recreational vehicle or manufactured
home owner; therefore, we have designed a heating system to signifi cantly improve all of your
comfort levels. Additionally, the Aqua-Hot hydronic heating system is a low-emissions, fuel
effi cient system that adds thousands of dollars in value to your RV or home.
We know that you must be eager to get underway, but take time to read and understand this
Use and Care Guide to understand the basic functionality of the Aqua-Hot. This guide should
be maintained in legible condition and kept in a safe, accessible location for future reference.
Should you have any suggestions on how we can better serve you, please do not hesitate
to contact us.
Technical Support can be contacted at
574-AIR-XCEL (574-247-9235)
. Hours of operation
are 7:00am to 4:00pm (MST) Monday through Friday.
The Aqua-Hot heating system is protected by the fi nest warranty in the industry (read about
it at the back of this manual).
Important Notes:
• A qualifi ed installer or service technician must perform equipment installation or service.
Contact Aqua-Hot for Factory Authorized Service Centers or Certifi ed technicians located
near you at www.aquahot.com/service-help, or call us at
574-AIR-XCEL (574-247-9235)
.
• Warranty work must be performed by an Aqua-Hot Factory Authorized Service Center.
• Your on-product identity label contains the specifi cations of your unit. Factory settings may
be adjusted by the vehicle manufacturer, confi rm fi nal setting with your dealer.
• Follow this guide exactly. Failure to do so may result in a fi re or explosion resulting in
property damage and/or personal injury.

Journey in Comfort
©Aqua-Hot® 125-GN1 Use and Care Guide
p. 2
Comfort Zone #1: Comfortable Cabin Heat.
Get heat where you want it, when you want it. This Aqua-Hot system puts heat where you need it. Therefore, your interior
temperatures will be just right. Don’t hesitate to crank up the heat because the Aqua-Hot system doesn’t remove moisture from
the air. From now on, you will have to blame the dry skin and itchy eyes on Mother Nature!
Comfort Zone #2: Quiet Operation
Say goodbye to rude awakenings from the forced air furnace, you’re an Aqua-Hot owner now! The Aqua-Hot is quiet when operating,
so you’ll never have to turn up the TV, yell across the room, or have an interrupted night of sleep again due to your heating system.
Comfort Zone #3: Comfortable Hot Water
Take showers knowing that your tank-less Aqua-Hot is ready and waiting to deliver hot water. The freedom to take a hot shower
when you want makes your experience much more like home.
Comfort Zone #4: Low Emissions
Aqua-Hot’s new low emission systems are fume-less and odorless. It’s good for you, good for your neighbor,
and good for the environment.
Comfort Zone #5: Large Service Networks
You won’t need to service your Aqua-Hot often, but when you do, you can be confi dent in our Certifi ed Service Centers that are
close by and trained to assist you with all of your Aqua-Hot specifi c needs.
Comfort Zone #6: Adds Value
The NADA Recreational Vehicle Guide lists Aqua-Hot as adding thousands of dollars to the value of a RV or caravan. That value will
pay off when it’s time to trade up or sell.
Comfort Zone #7: Low Fuel Costs
There’s no need to burn fuel each time heat or hot water is needed. The Aqua-Hot heats a boiler tank and uses the heat stored
in the liquid of the boiler tank to provide interior heat. Aqua-Hot’s 100 Series uses TribridHot™ technology to power the Aqua-Hot
system by pulling heat from one or a combination of heat sources. Use the electric setting to keep the boiler tank up to temperature
and for light heating needs. Use the burner when colder conditions require or when using hot water.

Introduction
©Aqua-Hot® 125-GN1 Use and Care Guide p. 3
Contents
Caution Notes .......................................................3
Safety Features ....................................................4
Component Call-outs ...........................................6
System Features ..................................................8
Operational Overview ...........................................9
Aqua-Hot Layout ...................................................11
Operational Flowchart..........................................12
Maintenance Schedule ........................................13
Winterizing the Aqua-Hot .....................................14
General Troubleshooting......................................15
Measuring Antifreeze Using a Refractometer ....16
Owner’s Service Log ............................................17
Warranty ...............................................................19
Caution Notes
As you read this information, take particular note of the NOTICE,
CAUTION, WARNING, and DANGER symbols when they appear.
This information is important for safe and effi cient use of the
Aqua-Hot system.
signals a situation where potential damage to the
Aqua-Hot could occur.
CAUTION signals a situation where potential harm or risk
of minor or moderate injury could occur if you do not follow
instructions.
WARNING signals a hazardous situation where potential harm,
risk of serious injury, or death could result if instructions are
not followed.
DANGER signals a situation where immediate risk of serious
injury or death will result if instructions are not followed.
NOTE: This manual will also use notes sections similar to
this one to draw attention to features and practices which
must be observed.

Safety Instructions
©Aqua-Hot® 125-GN1 Use and Care Guide
p. 4
Read all instructions before using the Aqua-Hot unit. Aqua-Hot
Heating Systems is not liable for damage resulting from failing
to follow instructions contained in this, and any other Aqua-Hot
documentation relevant to this unit.
• Read this user manual before using the Aqua-Hot System
to reduce the risk of injury to persons or damage to the
equipment.
• The product identity label contains specifi cations of the
unit, to what standard it has been tested, and important
safety notices.
• Disconnect electric wiring to the Aqua-Hot System before
welding or plasma cutting the RV to avoid damage to
equipment.
• The Aqua-Hot tank and heating loop operate at 0.0 PSI
(zero pressure system). Air pressure to the tank must not
exceed 18 PSI. Exceeding this rating will cause internal
damage to the Aqua-Hot.
• DO NOT connect the 12-volt DC power to the Aqua-Hot if the
vehicle requires welding.
• At maximum operating temperature, the coolant will be
very hot and scalding hot vapor or coolant may result in
serious burns or injury. Be aware of hot surfaces.
If the information in this manual is not followed
exactly, a fi re or explosion may result, causing
property damage, personal injury or death.
• Use special caution when children are present. Children
must not be allowed to play with the heater or perform
cleaning and maintenance.
• At maximum operating temperatures, the hot air outlet will
be very hot that may result in serious burns or injury. Be
aware of hot surfaces.
• The burner produces very hot temperatures that can ignite
surrounding fl ammable materials. The burner should be
turned off when loading or unloading fl ammable materials.
Safety Features
Low-Voltage Shutdown
The Aqua-Hot Controller is designed to operate between
11V DC and 16V DC. If the Controller detects that it is
receiving voltage below 11.8V DC, a System Voltage fault
will trigger a display on the LCD screen. If the Controller
system drops below 11.2V DC for 30 seconds, it will
discontinue operation of the Aqua-Hot heating system.
Over-Current
An Over-Current fault condition occurs when too much
current is drawn by a component, usually a fan or pump.
When this fault is triggered, the output channel is shut off
until the system has been reset or power-cycled.
Over-Temperature
An over-temperature fault will occur if your Aqua-Hot heating
system has reached 218°F. The Controller will deactivate
the heater and display an over-temperature fault on the
LCD display screen.
Low-Level Cutoff
If the system senses low fl uid levels, the heating system will
shut down all fans, heat sources, and pumps until the unit
is adequately refi lled.
House Power Sense
The Aqua-Hot Controller contains within it a fail-safe
functionality known as House Power Sense. This
functionality serves as a live signal to the Aqua-Hot allowing
it to continue operating. If power is lost to the on-board RVC
network or other on-board control systems, the controller
is signaled to shut down operation until a 12V DC power
signal is returned to the unit.
WARNING!
Read and understand all instructions using the Aqua-Hot
unit and the external gas burner. Aqua-Hot Heating Systems is
not liable for damage resulting from failing to follow instructions
contained in this, and any other Aqua-Hot documentation
relevant to this unit.
Improper installation, operation, adjustments, service, and
maintenance can cause personal injury or loss of life. Reference
this Use & Care Guide operation.
NOTE: Aqua-Hot recommends regular exercise of the Aqua-
Hot heating system to avoid issues with starting after a
several-month idle period.
NOTE: Contact your Authorized Service Center or Aqua-
Hot Heating Systems if you have any questions
starting any operation, service, or maintenance.
Information can be found online at www.aquahot.com.

Safety Instructions
©Aqua-Hot® 125-GN1 Use and Care Guide p. 5
Safe Operation
The Aqua-Hot Heating system consists of an electric
heating element and an external gas burner. The
electric element and/or the external gas burner heat
an ethylene glycol and water mixture, that fl ows
through tubing and into heat exchangers to heat
a zone that calls for heat. The heating system also
heats domestic water for hot water use in the shower
or at hot water faucets.
To safely and properly operate the Aqua-Hot 125GN,
please make sure that the fl uid level is up to the
“COLD” level line on the expansion tank before
heating. If the heater has already been activated and
running, the fl uid should be to the “HOT” level.
Locate the Aqua-Hot LCD screen (shown below)
inside the RV (contact the vehicle manufacturer if
unable to fi nd), tap the screen to wake, tap on either
the “ELECTRIC” to turn on the Electric Element or
“BURNER” to turn on the external gas burner. It will
take approximately 20 minutes to get the glycol fl uid
up to operating temperature. After the tank is to
temperature, you can turn on the heat on your RV
thermostat or run hot water.
As with any appliance, allow the Aqua-Hot to
completely shut down BEFORE disengaging
the RV 12V power disconnect.
General Care
• The Aqua-Hot 125GN’s fl uid levels should be checked
regularly to ensure it is at the proper level. It should be
checked when the Aqua-Hot is at maximum operating
temperature - when the external gas burner completes a
cycle or when the electric element disengages. The level
should be at the “HOT” mark on the expansion tank.
• It is necessary to take precautions during any user
maintenance. Note that the fl uid will be very hot, and any
scalding hot vapor or coolant could cause serious burns or
injury.
Intended Use
This manual explains the operation and care of the Aqua-Hot
heating system and controller. These instructions are approved
for the Aqua-Hot 125GN model for recreational vehicles only.
Not for use in boats.
Service and repairs may only be carried out by an authorized,
factory-trained Aqua-Hot technician. The heating system must
be installed/serviced in accordance with local codes, or, in the
absence of local codes, follow NFPA 1192.
• The vehicle owner is responsible for correct operation of
the appliance.
• The Aqua-Hot 125GN must comply with the codes and
regulations of the country it is being used in. National and
local codes must be followed, or follow NFPA 1192.
• Make sure to properly winterize the Aqua-Hot’s domestic
water system when not in use and/or any time the heater
is stored where freezing temperatures may be experienced.
The Aqua-Hot warranty will not cover claims for freeze
damage. Please refer to page 14 for proper winterization
of the Aqua-Hot.
• The external gas burner fuel system requires that the
gasoline used (in the vehicle) must be 87 octane or greater
(87, 89, 91, or 93 octane).
• In order to provide the best freeze protection, boil-over
protection, anti-corrosion, and rust protection, a mixture
of 50/50 Ethylene Glycol antifreeze and distilled water
is recommended. The Aqua-Hot 125GN boiler tank holds
approximately 1.8 gallons (6.8 liters). See page 13 for info.
Figure 1
NOTE: The Fuel System requires that the gasoline used (in
the vehicle) must be 87 octane or greater (87, 89, 91, or 93
octane).

Component Callouts
©Aqua-Hot® 125-GN1 Use and Care Guide
p. 6
Aqua-Hot 125GN
1. Fluid Circulation Pump
2. Tempering Valve
3. Aqua-Hot Controller
4. Antifreeze and Water Heating Solution Tank
5. AC Electric Element
6. AC Activation Relay
7. Plate-to-plate Heat Exchanger
8. Three-Way Valve
9. Zone Air-Bleed Valve
10. Fluid Expansion Port (to overfl ow bottle)
11. Zone Return
12. Fluid Fill Port
13. Zone Supply
14. Service Panel
15. External Gas Burner Supply
16. External Gas Burner Return
17. Domestic Cold-Water Inlet
18. Domestic Hot-Water Outlet
19. Domestic Low Point Drain
20. Cabinet Drain
Figure 3
Figure 2
11
13
14
15
17
18
10
9
19
20
12
16
3
1 2 3 4 5
6 7 8 9
Figure 4
Figure 5
NOTE: The side panel in the view above has been made
transparent to aid in the explanation of the heater. DO NOT
remove this side panel. Doing so risks irreparable damage
to the Aqua-Hot. Only remove the service panel for service.

Component Callouts
©Aqua-Hot® 125-GN1 Use and Care Guide p. 7
Figure 6
6
14
12
15
1
9
18
20
19
10
4
11
7
17
3
8
2
Belief Gas Burner
1. Combustion Air Fan
2. Burner Outer Casing
3. Burner Inner Casing
4. Combustion Chamber
5. Glow Plug
6. Flame Sensor
7. Temperature sensor
8. Over-Heat Sensor
9. Burner Controller
10. Air Inlet Pipe
11. Muffl er
12. Fuel Pipe
13. Coolant Pump
14. Fuse
15. Main Wire Harness
Connector
16. Fuel Pump
17. Exhaust Pipe
18. Coolant outlet Pipe
19. Coolant Inlet Pipe
20. Burner
Figure 7
Figure 8
Figure 9
16
5
13

Aqua-Hot System Features
©Aqua-Hot® 125-GN1 Use and Care Guide
p. 8
System Features
The Aqua-Hot 125GN Series is a Hydronic Heating System
that can provide heat and hot water on demand using a built-in
electric heating element and an external gas burner.
The Aqua-Hot Heating System is a 2-in-1 system
1. Interior Heating System: Provides quiet, comfortable
interior heat and even temperatures.
2. Tank-less Hot Water System: Provides a fl ow of comfortable
hot water.
The Aqua-Hot is powered by TribridHot™ technology and uses
one or a combination of the following heat sources:
• When plugged into shore power, or powered by a generator,
the electric element lets you use the power you are already
paying for to provide heat in mild conditions and meet your
light duty hot water needs.
• The external gas burner can be utilized with the Aqua-Hot to
heat and produce hot water.
Bring the Aqua-Hot to Operating Temperature:
Your Aqua-Hot hydronic heating system heats an ethylene
glycol antifreeze and distilled water solution that is stored in the
Aqua-Hot’s boiler tank. This water and antifreeze solution must
be up to operating temperature before the Aqua-Hot will provide
interior heat or comfortable hot water. To bring the Aqua-Hot up
to temperature, navigate to the climate page of the LCD screen,
and tap either the “ELECTRIC” or “BURNER” icon. Depending
on the ambient temperature, it may take up to 20 minutes for
the Aqua-Hot’s water and antifreeze solution to reach operating
temperature.
Once the tank is up to operating temperature, the electric
element may be used to maintain the operating temperature
and provide light duty hot water and interior heat.
For continuous hot water, or for heat in colder conditions, it
is recommended to utilize the external gas burner.
All vehicle installations must comply with the requirements
listed in the Recreational Vehicle Industry Association’s
(RVIA) ANSI/NFPA 1192 Handbook for Recreational Vehicle
Standards.
NOTE: This product label is attached to the side of the Aqua-
Hot, and provides a ready reference to specifi cations, test
standards, and important safety notices.

Activating the Aqua-Hot
©Aqua-Hot® 125-GN1 Use and Care Guide p. 9
Electric Element:
The electric element is the Aqua-Hot’s secondary heat
source and can be used when plugged into shore power.
The electric element will work to maintain tank tempera-
ture at 5°F below the heater activation threshold. It can
be activated by tapping on the ELECTRIC button of the
LCD screen interface.
The electric element has 2 modes: ON and OFF. When the
electric element is ON, the electric element will keep the
tank temperature between 165°F and 180°F. The elec-
tric element will toggle between ON and OFF as needed,
using temperature readings from the RV interior thermis-
tors. In OFF mode, the electric element is off and will not
provide any heat to the Aqua-Hot tank.
Operational Overview
The heating features are powered by the external DC
gas burner and/or the AC electric element on the 125GN.
These maintain the temperature of the Aqua-Hot’s
antifreeze and water heating solution to provide hot water
and interior heat.
External Gas Burner:
The gas burner is the Aqua-Hot’s primary and most
powerful heat source, and provides all of the heating
and hot water needs when cold temperatures exist, and/
or when there is a high demand for hot water. It can be
activated by turning the burner on by tapping BURNER to
ON on the LCD screen shown below.
The burner has 2 modes: ON and OFF. When the burner
is ON, the burner will keep the tank temperature between
160°F and 180°F. The burner will toggle between ON and
OFF as needed, using temperature readings from the RV
interior thermistors. In OFF mode, the burner is off and
will not provide any heat to the Aqua-Hot tank.
Figure 10
Figure 11
Operational Overview