Introducing the Aqua²
The Tankless Water Heater… Reinvented
At the heart of every Aqua² Tankless water heater is a revolutionary Flow-Tech® Heat Exchanger typically found in heating boilers. For the first time ever, boiler technology is being applied to the tankless water heater… The outcome is a unit that produces up to 7.02 GPM, can be vented up to 60’ with 2” PVC, has en EF rating of 97% and has recirculation capabilities and on board circ pump all built in to one tidy and well thought out cabinet. Gone are the days of messy wires, hot water fluctuation, and nuisance service calls. This user and service friendly design performs even better than it looks.
It’s a great trick if you can do it. We Did. The Aqua² by Radiant

Watch the Radiant company overview video.
Background
Radiant came into being in year 1959, when our founder Mr. Walter Battisti set-up this company meant, at that time, for the assembly of the heavy oil pressure jet burners.
54 years later, and thanks to the tremendous drive of the sons Luciano and Paolo, we now manufacture more than 180 different types of boilers: high-tech condensing units, atmospheric units along with solar/heat pumps and tankless water heaters.
We proudly export our products to more than 40 countries worldwide, and pride ourselves that our products are still 100% made in Italy. The remarkable strides we have made and continuous efforts in our R & D department have allowed us to develop several products we are proud to call our own. Such technologies include the MULTIPLEX® System, DUOPASS® System, ALLINCLUSIVE® System, DIGITECH® System, and finally our greatest achievement the FLOW-TECH® Heat Exchanger, which are widely known and appreciated around the globe.
Recognizing a need, and the potential of North America, Radiant is now available in North America for the first time ever. Our head offices are located in Toronto, Ontario Canada, with independent rep agencies strategically placed in both Canada and the United States.
At Radiant North America, we recognize that the journey with our customers begins with products that combine the highest in quality, reliability, longevity and efficiency.
But it doesn’t stop there.
We also recognize that customers demand value and we work with our trade partners to ensure that they receive the value they expect and are entitled to. This process starts with the initial purchase, and continues throughout the life of the product. The thousands of people involved in producing and delivering a Radiant product to your home or business understand that if you are not satisfied, we are not satisfied.
- Customers
- Employees
- Relationships with our suppliers
- Focus on constant innovation and improvement

As we continuously improve, we do so with environmental consequences top of mind.
We purposely incorporate cleaner technologies into our product development activities and have established contingency plans in the unlikely event of environmental incidents.
We take on the responsibility for promoting an understanding of the relevant environmental issues of our business among our employees, contractors and suppliers, as well as providing relevant training to encourage environmental responsibility.
We offer an array of training materials, including access to manuals, product specifications, designs, and literature, utilizing hard copy, the internet and e-book technology, where our manuals can be downloaded onto smart phones and tablets. Our fully functional training wall has several Radiant products installed, and fully functioning. This gives the technician the ability to get familiar with the product with hands on experience, and real time trouble shooting.
For more information and upcoming training dates, please contact our offices at 905.265.1527 and ask to speak to one of our representatives or email us at info@thermalhydronics.com
Looking for benefits for both partners and delivering not just what the partner expects, but exceeding those expectations. We add value to partnerships that enable them to grow. A “Radiant” partnership has to work for both partners. Or it’s not a real partnership.
At Radiant, we continue to develop an excellent reputation, built solidly around the key requirements of ALL our trade partners, – quality, reliability, energy efficiency and excellent global support services.
These are crucial elements that cement the long term nature of commitment, particularly in ensuring continuing high standards of service, maintenance and spares availability, with re-training of local staff where appropriate.
Products
We have been at the forefront of heating technology for over 50 years and continue with our product line of condensing or non-condensing boiler technology. Many of our boilers have the built in capability to produce domestic hot water; others can be coupled with indirect hot water tanks to provide it.
All of our condensing boilers meet the California NOx emission requirements.
Our latest products takes efficiency to the next level, coupling the advantages of central boiler systems with the ability to specifically control the level of comfort in individual residential or commercial suites via the Cloudwarm® App. Available for IOS and Android. Floor heating, Hot water on demand, or a traditional radiator… Radiant has a product to fulfill you and your customers needs.

AIR HANDLERS
Discover the benefit of using patent pending Radiant Ecosmart Air Handlers to reduce the cost of heating your home and hot water. One source, two outcomes.
OUTSTANDING THERMAL EFFICIENCY
RADIANT boilers offer a remarkably high 97% thermal efficiency. This means that $0.97 out of every fuel dollar goes into heating the water, dramatically reducing the operating cost of the equipment. RADA achieves this efficiency through the combination of an advanced fan assisted combustion system and highly durable 316 stainless steel exchanger. A time tested proven combination.
The heat energy from the combustion process is transferred to the water as it passes through the 316 stainless steel heat exchanger. The sealed combustion design eliminates external heat losses, this means that the energy dollars heat the water, not the mechanical room. It also ensures that the boiler jacket stays cooler, providing greater safety, and requires less clearance from combustible walls.

Innovation
Where to buy
ATTENTION: UNAUTHORIZED DISTRIBUTION OR SALE OF RADIANT BOILERS AND OR RADIANT RELATED PRODUCTS WILL NOT BE COVERED UNDER THE WARRANTY AGREEMENT WHATSOEVER
ATTENTION: UNAUTHORIZED DISTRIBUTION OR SALE OF RADIANT BOILERS AND OR RADIANT RELATED PRODUCTS WILL NOT BE COVERED UNDER THE WARRANTY AGREEMENT WHATSOEVER

Enercare Home Services T. 844-535-7194 enercare.ca

Omega Heating & Air Inc. T. 416-543-9456 omegaheatingandair.ca

Aerosmith Mechanical Services T. 647-404-5125 aerosmithmechanical.com

RJM Gas Inc. T. 416.346.2931 rjmgas.ca

Rainbow Mechanical Services Limited. T. 905.761.9101 rainbowmechanical.com

Hamco Heating and Cooling Ltd. 905.527.1049 hamco.ca
FAQ – From Contractors & Distributors
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We absolutely require that a chemical inhibitor is used in the heating loop. We have found that without this, debris can come loose, causing fouling in the boiler. In fact, if an inhibitor is not used, our warranty is invalidated. A couple of examples of commonly used inhibitors are those made by Fernox and Sentinel. We accept these products and others that are demonstrated to perform similarly. Today’s boilers are highly sophisticated, and protecting this investment is simply common sense.
All Radiant boilers come with pumps that have air eliminators built in. Your contractor will open the eliminator up to bleed the air out of your system.
Cold water holds more air than hot water, so when first filled with cold water, the system contains a lot of dissolved air. Once your boiler heats the water, the air comes out of solution and moves with the flow of water. It is important to remove the air because it can block the flow of water. Air will also cause noise as it moves though the pipes.
A heating professional will also use automatic air vents at the high points of a system to eliminate air bubbles that do not generally move downward with the flowing water back to the air eliminator because of their buoyancy. It is highly recommended that additional air eliminators are added to any heating system in addition to the air eliminators that comes factory installed in every Radiant product.
RADIANT branded products are guaranteed for two years from the date of acquisition and/or installation (based on invoice or other financial document). In the absence of an invoice or fiscal document, the warranty shall be for a maximum of 2 1/2 years from the date of manufacture of the product. The date of manufacture can be determined from the first four digits of the 10-digit serial number:
Example: 3707301201
The first two digits, in this case 37, correspond to the year 2007 and the next two digits, in this case 07, correspond to Week 7 of the production year.
Warranty for RADIANT branded products sold in Canada
- 10* years on the Combi Tech Heat Exchanger – ALL MODELS
- 2 years on every component within the cabinet.
Exclusions under warranties for RADIANT branded products
- Scaling, impurities or other deposits in the water feed circuit due to lack of treatment, filtration or incorrect installation
- Scaling, impurities or other deposits in the waste water circuit due to lack of treatment, filtration or incorrect installation
- Breakage during transport, lack of water, freezing, fire, theft, storm, vandalism, corrosion, condensation, poorly performed descaling, sludging, ineffective chimneys, insufficient or improper ventilation, presence on site of any other equipment which may discharge noxious or dangerous gases, improper evacuations and discharges, improper use of the equipment, installation in an unsuitable place.
- Normal wear, such as anodes, circulators, gas regulators, diaphragms, etc.
- Failure to follow maintenance instructions for the product, according to the applicable laws
- Failure to follow applicable standards of electrical installation, hydraulic assembly and fuel feed
- Failure to follow the instructions in the product documentation
- Damage caused during assembly, disassembly or modification of RADIANT products by persons other than Thermal Hydronic Supply Ltd. personnel
- Lack of invoice or fiscal document (in the case of §2 extensions only)
- This warranty does not cover the labour and shipping costs associated with installing a repaired component or replacement of a boiler.
Important Information
- The warranties mentioned cover the replacement of the part found to be defective; transportation, labour and taxes are the client’s responsibility
- Replacement of a portion or all of the parts of RADIANT branded products and/or original accessories does not change the original validation date, effective date or duration of the warranty
Thermal Hydronic Supply Ltd. is the sole company authorized by Radiant Bruciatori S.p.A. Italy to execute the warranty work outlined above.
*Unless otherwise noted.
Warranty Registration Card (Please click here for online Warranty Registration Form)
FAQ – From Home & Business Owners
It is true that most homes in North America are heated using forced air furnaces. In Europe, and other parts of the world, where energy is much more expensive, virtually all space heating and domestic hot water heating is done with boilers. Simply put, water is a much more efficient way of heating; greater efficiency means lower energy costs. In addition, increased efficiency means lower carbon dioxide emissions. And if space is a concern, a wall hung boiler is about as space efficient a heating appliance as you can get. A wall hung boiler large enough to heat a home is not much bigger than a kitchen cupboard.
There are other advantages to heating with water. If you are using an in-floor system, the comfort level, with the heat below your feet is noticeably better and with in floor or radiator systems, because you do not have the air movement associated with forced air systems, circulating dust is greatly reduced; this is especially important for people who experience dust allergies.
You also have the option to couple your boiler with an air handler and traditional duct work in your home. You now have the combined benefits of a high efficiency hydronics heating system with the ability to operate a central air conditioning unit. Your home will function and operate just as it does the use of a furnace. Only there will be one combustible source to generate your heating and how water demands, not two. One gas line, one vent, and one appliance using fuel and consuming energy, which also allows you to eliminate the need for a hot water tank in your home. Lowering household expenses and saving you money. The benefits are endless.
All boilers under certain conditions will condense. The difference between a condensing and non-condensing boiler is that a condensing boiler is designed to operate and survive long term in a condensing evironment. A non-condensing boiler will not last, because condensate is corrosive.
The condition that causes a boiler to condense is reduced flue gas temperature. The point at which condensing will occur, also called the dew point of the products of natural gas (or propane) combustion, is about 130F. Above this temperature, the moisture entrained in flue products as water vapor will remain vaporized. Below this temperature, the water vapor will change phase and condense out of the flue products as liquid. When this phase change occurs, additional energy is released that is beyond the sensible heat of the flue products. In a boiler, this phase change occurs on a heating surface and the released energy transfers through the heating surface into the boiler water on the other side. By capturing this energy, which is lost out the exhaust stack on a conventional system, a condensing boiler gains efficiency, thus making it much more efficient.
Naturally, the products of combustion cannot be reduced in temperature to 130F unless some of the heating surfaces in the boiler are also less than or equal to 130F. The only way to accomplish this is to have an entering boiler water temperature of less than or equal to 130F. Simply stated, if return water to the boiler is higher than 130F, condensing cannot occur; even if the boiler modulates and is at its lowest firing rate. This is determined by the laws of physics. The highest achievable efficiency that can occur without condensation forming inside the boiler is approximatley 87%.
The highest efficiency numbers occur when cooler water return temperatures are combined with the ability of the boiler to reduce its firing rate by modulating or staging. Under optimum conditions, reduced firing rate efficiency of condensing boilers can exceed 95%.
AFUE stands for the “Annual Fuel Utilization Efficiency. AFUE is an energy efficiency value determined through a simulation test that represents the operating efficiency of an average installation over the course of a heating season. While AFUE provides a true indication of operating fuel costs, thermal efficiency represents steady state efficiency. Steady state efficiency does not consider efficiencies throughout the input range and typical on/off cycles the boiler is expected to operate.
ENERGY STAR® provides AFUE values for products that have an ENERGY STAR® http://www.energystar.org designation and the American Heating and Refrigeration Institute – AHRI www.ahrinet.org provides AFUE values for products listed with that organization.
Your boiler needs to produce enough heat to compensate for the building’s loss of heat on the coldest day of the year. Heating professionals have sophisticated computer programs that can calculate the right size boiler you need. These are called heat load calculations and, among other things, take into account the size of the building, its age, amount of insulation, type and number of windows, building openings, and the climate in your area.
The contractor will then select a Radiant boiler that operates within the maximum heat loss of the building. Since Radiant boilers modulate, the Radiant boiler selected will operate at the heat output that matches the heat loss of the building on the coldest day, or on milder days at optimal efficiency at all times thanks in part to a 9:1 or 10:1 modulation rate depending on the model you choose.
Your Radiant product comes with a 10 year warranty on the heat exchanger, and a two year warranty on all components. Please refer to your owners manual for the exact terms and conditions.
Warranty Registration Card (Please click here for online Warranty Registration Form)
Contact Us
Phone: 905.265.1527
Fax: 905.265.9739
Toll-Free: 1.877.836.7772
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