Airxcel Aqua-Hot 100 Series User manual

Use and Care Guide
100Series
AHE-100-DE1

Journey in Comfort
©Aqua-Hot® 100DE Use and Care Guide
p. 2
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 reached at [phone]:00 to 16:00 CET
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 [phone].
• 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

Introduction
©Aqua-Hot® 100DE Use and Care Guide p. 3
Contents
Caution Notes .............................................................3
Safety Features ..........................................................4
Component Call-outs .................................................6
System Features ........................................................8
Operational Overview .................................................9
Operational Flowchart..............................................11
Layout Example ........................................................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.
NOTICE 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
should be observed.

Safety Instructions
©Aqua-Hot® 100DE Use and Care Guide
p. 4
Read all instructions before installing 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 manual before installing or 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 standards 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 Pa (zero
pressure system). Air pressure to the tank must not exceed
124 kPa. Exceeding this rating will cause internal damage
to the Aqua-Hot.
• Use caution when working on or near any propane/diesel
fuel system.
• DO NOT connect the 12-volt DC power to the Aqua-Hot if the
vehicle requires welding.
• At maximum operating temperature, the coolant and vapor
will be very hot and scalding that 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.
• This appliance can be used by children aged from 3 years
and above, and persons with reduced physical, sensory, or
mental capabilities, or lack of experience and knowledge if
they have been give supervision or instruction concerning
use of the appliance in a safe way and understand the
hazards involved.
• The outlet must not be connected to any tap or fi tting other
than those specifi ed.
• The water inlet of this appliance shall not be connected to
inlet water obtained from any other water heating system.
• Do NOT switch on if there is a possibility that the water in
the heater is frozen.
• This appliance is not to be used for a potable water supply.
• The heater must not be located immediately below a
socket-outlet.
•
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 only
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 the Aqua-Hot heating
system has reached 103° C (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.
As with any appliance, allow the Aqua-Hot to
completely shut down BEFORE disengaging the RV
12V power disconnect.
In order to avoid overheating, do NOT cover
the heater.

Safety Instructions
©Aqua-Hot® 100DE Use and Care Guide p. 5
Safe Operation
The Aqua-Hot Heating system consists of one electric
element and external diesel burner. The electric element
and/or the diesel burner heats a glycol and water mixture,
that fl ows through tubing and into heat exchangers that
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 100D,
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 the “BURNER” or
“ELECTRIC”. It will take up to 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.
General Care
The Aqua-Hot 100D’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 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.
• These instructions are approved for the Aqua-Hot 100D
model for recreational vehicles.
• Installation and repairs may only be carried out by an
authorized, factory-trained Aqua-Hot technician. The
heating system must be installed in accordance with local
codes.
• The vehicle owner is responsible for correct operation of
the appliance.
• The Aqua-Hot 100D must comply with the codes and
regulations of the country it is being used in. National and
local codes must be followed.
• 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.
• 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 100D boiler tank holds
approximately 6.8 litres (1.8 gallons).
• The mixture may be modifi ed to provide the most adequate
freezing, boiling, and rust/anti-corrosive protection. A
50/50 mixture of Ethylene Glycol and distilled water has
a freeze point of approximately -37°C (-35°F) and a boiling
point of approximately 106°C (223°F). Reference page 16
for measuring the antifreeze mixture with a refractometer.
Figure 1

Component Callouts
©Aqua-Hot® 100DE Use and Care Guide
p. 6
1. Tempering Valve
2. Fluid Circulation Pump
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. Zone Return
11. Fluid Expansion Port (to overfl ow bottle)
12. Fluid Fill Port
13. Zone Supply
14. Heat Source Return (optional)
15. Heat Source Supply (optional)
16. Domestic Cold-Water Outlet
17. Domestic Hot-Water Inlet
1 2 3 4 5
67 8 9
11
12
13
14
15
17
16
3
10
9
Figure 2
Figure 3
Figure 5
NOTE: The side panel has been made transparent in the view
above to aid in the explanation of the heater. DO NOT remove
the side panel, only the service panel can be removed. Doing
so risks irreparable damage to the Aqua-Hot.
Aqua-Hot 100D
Figure 4

Component Callouts
©Aqua-Hot® 100DE Use and Care Guide p. 7
1. Combustion Air Fan
2. Fluid Outlet
3. Fluid Inlet
4. Combustion Chamber
5. Circulation Pump
6. Exhaust Gas Temperature Sensor
7. Exhaust Outlet
8. Air Inlet
9. Control Unit
10. Burner Motor
11. Fuel Inlet
12. Combustion Air Inlet
13. Fuel Pump
1 32
5
13 2
11
6
9
10
7
Figure 6
4
10
9
Figure 7
8
4
512
Aqua-Hot Diesel Burner
Figure 8
5
13
Figure 9

Aqua-Hot System Features
©Aqua-Hot® 100DE Use and Care Guide
p. 8
System Features
The Aqua-Hot 100D 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 diesel 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 diesel 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 based 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 “BURNER” or “ELECTRIC”
icon. Depending on the ambient temperature, it may take up
to 20 minutes for the Aqua-Hot’s distilled 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 diesel burner. 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.
This unit is CE certifi ed. Any modifi cations made to this unit
not outlined in offi cial literature or expressly authorized by
Aqua-Hot will void this certifi cation.

Activating the Aqua-Hot
©Aqua-Hot® 100DE Use and Care Guide p. 9
Operational Overview
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 temperature 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 4 modes: LOW, HIGH, AUTO, and OFF. While in LOW
mode, the element will maintain a tank temperature of 77°C
and minimum temperature of 74°C. In HIGH mode, the element
will keep the tank temperature between 74°C and 82°C. In
AUTO mode, the element will toggle between HIGH and LOW
as needed, using temperature readings from the RV interior
thermistors. OFF mode, the 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 diesel
burner and/or the AC electric element on the 100D. These
maintain the temperature of the Aqua-Hot’s antifreeze and
water heating solution to provide hot water and interior heat.
External Diesel Burner:
The diesel 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 4 modes: LOW, HIGH, AUTO,
and OFF. While in LOW mode, the burner will maintain a tank
temperature of 74°C and minimum temperature of 71°C. In
HIGH mode, the burner will keep the tank temperature between
71°C and 82°C. In AUTO mode, the burner will toggle between
HIGH and LOW as needed, using temperature readings from the
RV interior thermistors. OFF mode, the burner is off and will not
provide any heat to the Aqua-Hot tank.
Figure 10
Figure 11

Activating the Aqua-Hot
©Aqua-Hot® 100DE Use and Care Guide
p. 10
Heat Priority Option:
The Aqua-Hot comes equipped with the three-way valve
(sometimes known as the summer/winter valve). This controls
the fl ow of the antifreeze and water heating solution within
the Aqua-Hot to deliver either hot water or interior as priority.
Tapping on this element will change the valve’s orientation.
When this element displays “INT. HEAT”, this valve is oriented
to provide interior heat by circulating the heating solution
throughout the interior heating zone. When the element says
“HOT WATER”, the valve is oriented so that the heating solution
is routed to prioritize hot water.
Controlling Heat Levels with Room Thermostat:
When the Aqua-Hot is on and up to operating temperature,
adjust the room thermostat to the desired temperature and it
will automatically activate the Aqua-Hot’s heating functions to
maintain the desired interior temperature.
Different manufacturers may use different types of thermostats.
Please contact the dealer or manufacturer for the exact type,
location, and thermostat operation.
Aqua-Hot LCD Display
The Aqua-Hot electronic display provides direct diagnostic and
control of the Aqua-Hot. This display is directly interfaced with
the Aqua-Hot to relay real-time operational information such
as unit diagnostics, warnings, faults, and operating conditions.
Please contact Aqua-Hot, or your vehicle manufacturer for more
information.
Using Hot Water:
The Aqua-Hot 100D is a Hot Water Priority heating system.
Meaning that the 100D cannot heat the interior of the RV and
produce hot water simultaneously. When hot water is being
used, the interior heating system will shut off temporarily, until
hot water is no longer being used.
When hot water is requested, domestic water from the RV’s
fresh water tank is transported through the domestic water line,
that goes into a heat exchanger located in the Aqua-Hot. The
water is then heated by transfer from the heated antifreeze and
distilled water solution. The heated domestic water then fl ows
through the tempering valve to be mixed with cool water from
the fresh water tank to achieve an appropriate temperature
before it fl ows to the faucet.
Figure 12 Figure 13
Operational Overview

Operational Flow Chart
©Aqua-Hot® 100DE Use and Care Guide p. 11
Operational Flow Chart
A heat source is selected from
Interior Switch Panel
Electric Element External Diesel Burner
Electric Heating Element
will activate, providing
heat to the antifreeze and
water heating solution
within the boiler tank
The diesel burner will
begin providing heat to the
antifreeze and water heating
solution present within the
boiler tank.
The antifreeze and water
heating solution in the boiler
tank heats to 82°C
An Interior Zone
Thermostat Calls
for Heat
A hot water faucet opens,
signaling a need for heat to the
boiler tank
The fl uid circulation pump
activates and begins circulating
the heated antifreeze and water
solution throughout the interior
heating zone
The heating zone
fans activate
Heat is transferred to the
vehicle interior via the heat
exchangers
The cooled antifreeze
is returned to the boiler
tank to be reheated.
Hot water fl ows from the water
faucet
Heat is transferred to the
domestic hot water system

Operational Flow Chart
©Aqua-Hot® 100DE Use and Care Guide
p. 12
Layout Example
Figure 15
Cozy #1
Living Space
Figure 14
Diesel Burner
Cozy #2
Kitchen
Cozy #3
Bedroom
Aqua-Hot
Heating System
Diesel Burner
Cozy #1
Living Space
Aqua-Hot
Heating System Cozy #2
Kitchen
Cozy #3
Bedroom
NOTE: This is just a sample for the layout of the diesel burner
with the Aqua-Hot and heat exchangers. Actual placement
may vary on the individual design of the RV. For questions or
assistance, contact us at [phone].

Maintenance
©Aqua-Hot® 100DE Use and Care Guide p. 13
Maintenance Schedule
Monthly Maintenance
Check the Aqua-Hot’s antifreeze and distilled water heating
solution to ensure that it is at the proper level. This can be
accomplished by visually checking the coolant level in the Aqua-
Hot’s expansion bottle; reference Figure 18 on page 15.
Please note that the coolant level should be checked ONLY
when the Aqua-Hot is at maximum operating temperature.
This should be done immediately after the electric element
disengages, or after the diesel burner has completed a cycle.
At maximum operating temperature, the antifreeze and water
heating solution should be at the level marked “HOT” on the
expansion bottle.
It is also recommended to run the diesel burner once a month
for a full cycle (at least 20 minutes) to ensure optimum heater
condition.
Annual Maintenance
To maintain the Aqua-Hot at its full potential, it is highly
recommended to have the diesel burner tuned up annually. This
involves the fuel fi lter replaced, burner cleaned, inspecting the
exhaust and combustion air lines for damage and ensure they
are clear, checking the fuel lines for any leaks, checking the
hoses and wiring to make sure there is no damage or cracks.
Replenishing the Antifreeze and Water Heating
Solution
If the antifreeze and distilled water heating solution needs
replenishing, remove the cap for the expansion bottle and fi ll it
to the “HOT” mark. Replace the expansion bottle cap when this
is complete. DO NOT operate the unit without fi rst replacing the
cap of the bottle. Excess air will escape through this bottle as
the stir pump of the unit operates. While bleeding this system
of air it will be necessary to continue to fi ll the bottle until this
process is complete.
The Aqua-Hot does not need regular replacement of the
ethylene glycol antifreeze and distilled water heating solution,
but in the event that more antifreeze is required, contact Aqua-
Hot Heating Systems to purchase antifreeze, or for guidance
in selecting an appropriate antifreeze product for use with this
unit.
When the Aqua-Hot is at maximum operating temperature, the
coolant is very hot. If the Aqua-Hot heating system is accessed,
scalding by hot vapor or coolant may occur. Before cleaning or
servicing, disconnect all power supplies.
DO NOT operate the external diesel burner and/or electric
heating element without antifreeze and distilled water
heating solution present in the Aqua-Hot’s boiler tank. Doing
so will cause serious damage to the heater.
Overheat Protection
Every Aqua-Hot is equipped with at least two overheat
protection devices. These are commonly known as the high-
limit thermostats. These thermostats operate by maintaining a
circuit while the unit is below 103° C (218° F).
In the event of an overheat condition, the high limit
thermostats will cut the operating signal to the diesel burner
and/or the electric element. When this signal is interrupted, the
electric element and diesel burner will immediately disengage.
Contact Aqua-Hot for assistance in locating a qualifi ed person
to service this heater.
DO NOT attempt to reset the high-limit thermostats after
an overheat condition until the unit has been serviced by a
qualifi ed technician. Failure to do so could result in damage
to the unit, personal injury, or death.
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 100D boiler tank holds
approximately 6.8 litres (1.8 gallons).
The mixture may be modifi ed to provide the most adequate
freezing, boiling, and rust/anti-corrosive protection. A 50/50
mixture of ethylene glycol and distilled water has a freeze
point of approximately -37°C (-35°F) and a boiling point of
approximately 106°C (223°F). Refer to the table below to
determine the best protection mixture ratio. Reference page 16
for measuring the antifreeze mixture with a refractometer.
Freeze
Point (°C)
Concentra-
tion (%)
0 -4 -7 -12 -15 -17 -23 -29 -34 -40 -46 -57
0 10 16 21 25 29 33 39 44 48 52 56
Ethylene Glycol

Winterization
©Aqua-Hot® 100DE Use and Care Guide
p. 14
Winterizing the Aqua-Hot
The Aqua-Hot’s domestic water heating system must be
completely drained of domestic water at any time the heater is
stored where freezing temperatures may be experienced.
Please follow these instructions when winterizing the Aqua-
Hot domestic water heating system. Reference Figure 16 for a
system overview.
1. Completely drain the fresh water storage tank.
2. Disconnect the domestic water demand pump suction line
from the fresh water storage tank.
3. Attach an adequate piece of hose onto the suction side of
the domestic water demand pump.
4. Place the opposite end of the hose into an adequate supply
of non-toxic RV winterization antifreeze and allow the fl uid
to pump through.
5. Open and close all interior and exterior water faucets one
at a time, until ONLY pure RV antifreeze is present. Perform
this procedure for both cold and hot water faucets.
6. Remove the hose and reconnect the domestic water
demand pump’s suction line to the fresh water storage
tank.
NOTE: The Aqua-Hot can continue to be used for interior heat
once the domestic hot water system has been winterized. De-Winterization
To de-winterize the Aqua-Hot system, completely fi ll the
fresh water storage tank with clean water. Open and close the
interior and exterior faucets, one at a time, until only clear water
is present.
Disinfecting the Domestic Water System
The Aqua-Hot Heating components are not compatible to
prolonged exposure to sodium hypochlorite (bleach or liquid
bleach). Using products containing bleach, including water
refreshers, may cause corrosion of the domestic water lines,
resulting in a catastrophic failure of the Aqua-Hot system by
creating leaks that cannot be repaired. This damage is not
covered by the Aqua-Hot warranty.
If disinfecting the hot water heating system, be sure to follow
any national and current regulations and standards, or any
other applicable local standards, for Potable Water Systems.
Not winterizing the Aqua-Hot when freezing temperatures
are present will result in serious damage to the Aqua-Hot
heating system. Ensure that only RV antifreeze rated for
winterization is used when winterizing this unit.
To Hot Water Outlets
Tempered
Domestic Hot Water
Fresh Water
Storage Tank
Cold Water Faucets
Demand Pump Tempering
Valve
Figure 16

Use and Operation
©Aqua-Hot® 100DE Use and Care Guide p. 15
General Information
Should the Aqua-Hot Hydronic Heating System fail to operate,
and there is a lack of hot water and/or heat, complete the
following checks:
1. Verify that the Aqua-Hot is supplied with electrical power.
2. Make sure there is an adequate supply of diesel fuel (at
least ¼ tank).
3. Ensure that the Aqua-Hot boiler tank has an adequate
supply of antifreeze and water heating solution by
checking the level at the expansion tank. If the level is low,
reference the maintenance section of this guide for refi lling
instructions.
4. Verify the functionality of any in-line fuses connected to the
Aqua-Hot. Replace these fuses if necessary.
5. Ensure that all coach-side hot water faucets are closed.
6. Visually inspect the interior of the Aqua-Hot to ensure that
there are not any pinched or damaged wires.
7. Locate the high-limit thermostats (3) within the Aqua-Hot.
Test these thermostats for functionality, and replace if
necessary.
8. Locate and test the ETS module for functionality. Replace
if necessary.
9. Locate and test the fl uid circulation pump. Replace if
necessary.
10. Locate the three-way valve and test it for functionality.
Replace if necessary.
11. Make sure there are no faults displayed on the LCD screen.
NOTE: The fl uid level sensor is located in the Aqua-Hot’s
expansion tank. If the antifreeze solution in the expansion
tank drops below the level of the fl uid sensor, the Aqua-Hot
will not operate.
Hot Fluid Line
Cold Fluid Line
Fluid Level Sensor
Fill Cap
Lower Fitting
Upper Fitting
Figure 18
General Troubleshooting
Figure 19
Figure 17
Expansion Bottle
Connection
Fluid Fill Port

Appendix
©Aqua-Hot® 100DE Use and Care Guide
p. 16
Eyepiece
Calibration
Screw
Daylight Plate
Assembly
Prism Assembly
Properly Apply Antifreeze to the Prism Assembly
Use the guide below to properly apply the ethylene glycol
mixture to the prism assembly of the refractometer. Once that
is complete, peer through the eyeglass of the refractometer to
continue to the next step.
Adjust the Boundary Line
Once the glycol solution has been properly applied, adjust the
calibration screw until the boundary line labeled “Ethylene
Glycol” is set to 0°C (32°F). The graphic to the right has been
designed as an aid, but note that it may differ from what is
shown in the refractometer sight glass.
Poor Poor Good Boundary Line
Adjust to 32°F
Lower White Field
Upper Blue Field
Refractometer Sight Glass
Measuring Antifreeze Using a Refractometer
Application of Ethylene Glycol
Measuring Antifreeze

Service Log
©Aqua-Hot® 100DE Use and Care Guide p. 17
DATE SERVICE PERFORMED SERVICE CENTER

Service Log
©Aqua-Hot® 100DE Use and Care Guide
p. 18
DATE SERVICE PERFORMED SERVICE CENTER

2-YEAR LIMITED WARRANTY AQUA-HOT®
HYDRONIC HEATING SYSTEM
Aqua-Hot Heating Systems Inc. warrants the Aqua-Hot Heater to be free from
defects in material and workmanship under normal use and service for a period of two years
on both parts and labor commencing upon the original date of registration of the vehicle.
Replacement parts are warranted for the remainder of the Heater’s standard warranty
coverage or for six months, whichever is greater. The intent of this warranty is to protect
the heater’s end-user from such defects, which would occur in the manufacturing of the
product. Thus, problems due to improper specifi cations, improper installations, improper
use, the use of accessory parts or parts not authorized by Aqua-Hot Heating Systems Inc.,
repair by unauthorized persons, and damage or abuse of the heater are specially excluded
from warranty coverage.
For additional information, or to obtain a warranty repair authorization, please
contact the Aqua-Hot Heating Systems Warranty Administrator at [phone] (07:00
to 16:00 Central European Time) or visit www.aquahot.com.
My Comfort Zones are On-Board
Vehicle:
Purchased From:
Dealer Information:
Name:
Location:
Phone Number:
Heating System:
Serial Number:
Warranty

Aqua-Hot Heating Systems, LLC
Via Nazionale 65
25080 Puegnago del Garda
Brescia BS
Italy
Visit us online at www.aquahot.com
Call us at [phone]
©2020 Aqua-Hot Heating Systems, LLC.
USE AND CARE GUIDE
100SERIES