Why Aqqua HotStream?

For campers, boats, off-grid homes, and other 12V DC applications, there is simply nothing else on the market that provides hot water delivery performance with low power consumption practical for battery operation. At only 3.3A max current (40W) and less than 1A idle, Aqqua HotStream can literally operate for days on a single charge (typical 100 aH deep cycle battery).

In the home and other 110/120V AC applications, conventional centralized water heating systems are both inconvenient and wasteful. Aqqua HotStream saves time and energy with absolutely no waste.

Specific benefits and comparison with competing point-of-use systems are described in detail in the following sections.

Instant Hot Water Plus Water & Energy Conservation 

The problem with conventional water heaters is that they are centrally located and it takes up to two minutes for hot water to arrive at the faucet. All you needed was enough hot water to wash your hands or shave – normally less than a quart. In the process however, several gallons of precious water are wasted, and the energy used to heat it is lost in the water lines between the water heater and the faucet. With Aqqua HotStream, you get instant hot water and conserve both energy and water. 

To estimate energy savings, one must compare thermal line losses that occur with a central water heater with the additional standby losses (energy it takes to maintain hot-water temperature) in a point-if-use water heater. The major factors in determining thermal line loss are length and size of the water-line between the central water heater and faucet, water-line insulation and surrounding environment, ambient temperature, and frequency of use. While this is a complicated calculation with many scenarios to consider, studies show that energy savings from distributed water heating in a residential setting average around 30% compared with central water heat.

Aqqua HotStream uses a patent-pending design that optimizes hot water delivery performance and energy efficiency. 

Reduced Installation Cost

Compared with point-of-use tankless water heaters, electrical infrastructure costs are dramatically reduced with Aqqua HotStream. Tankless systems typically require 207/240/277V AC circuits and consume 4.5 to 12kW of power during operation. Most existing homes do not have pre-existing circuits necessary to support these systems near the sink, and the cost to install is estimated at $1,500. 

Competing mini-tank systems draw far less power than tankless models, but 1.5 kW is typical. They can operate on a dedicated 15A 120V circuit, but may also require installation of additional electrical circuits.

Aqqua Hotstream operates on either 12V DC or 12V AC and draws only 40W power. A Class-II transformer is used to convert 120V AC power to 12V for household applications and plugs into a conventional electrical outlet. 

Service Life

Aqqua HotStream is designed for maximum service life.  

The biggest factor in the service life of a water heater is the accumulation of minerals such as calcium carbonate in the tank. Minerals dissolve in water stored in large tanks for long periods of time, and is exacerbated by direct exposure to heating elements that induce mineral separation from the water. These minerals deposit on tank walls and heating elements, causing reduced efficiency and increaseheating element failure.

Heating elements in the Aqqua HotStream never come into direct contact with water. So mineral separation caused by direct exposure, and heating element failure caused by exposure are eliminated.

We also use 100% stainless steel material for all components that come in contact with water to eliminate corrosion.

We are so sure you will love your Aqqua HotStream that we back it with a 30-day money-back, satisfaction guarantee, and 10-year warranty against defects in material and workmanship


The risk of electric shock is always a factor when you combine water and electricity, and it's worse with high voltage/power circuits. Since the Aqqua HotStream operates on low-voltage, the risk of electric shock is virtually eliminated.  

Hot Water Delivery Performance

Tankless water heaters heat water "on-the-fly" and do not store hot water at the point of use. So, they are flow-rate limited depending on required temperature rise and available power. Low power tankless systems often suffer from inability to deliver the required flow rate at the desired temperature. The result is warm (not hot) water or low flow rate.

Typical point-of-use mini-tank systems use a single tank to store hot water. But as soon as the faucet is turned on, cold water from the feed line begins to mix with the hot water, and the delivery temperature begins to drop almost immediately. To compensate an over sized storage tank is typically used. An that means higher energy use and more space required for installation.

The Aqqua HotStream uses a patent-pending design that incorporates water compartmentalization and heat prioritization controlled through an embedded micro-processor to optimize hot water delivery performance and energy efficiency.

Occasional Use, Small Draw Applications 

Connect the Aqqua HotStream to the cold water supply at the sink and you eliminate line losses completely. This is ideal for applications where draws are occasional and relatively small. Bathroom and shop sinks are good examples, where most hot water use is for hand washing or other tasks where less than a gallon of hot water is used. Aqqua HotStream delivers more than enough hot water to accomplish the task at hand, and with no water or energy waste. So does that mean I'll run out of hot water after one gallon? If you just let the tap run, yes. But if you use only what you need, our field tests show that under normal operating conditions, you will always have a ready supply of hot water. It takes a little discipline, but nothing we shouldn't be doing anyway.

Higher Draw Applications

Connect the Aqqua HotStream to the hot water supply and you benefit from the convenience of instant hot water but never run out. At the kitchen sink, for example, hand washing and other low-draw tasks still represent most hot-water use. But on occasion, you need to draw enough to fill the sink. So if Aqqua HotStream runs out of hot water, just keep the faucet running, and hot water from the central water heater will arrive soon. In the process, you re-prime the Aqqua HotStream thus eliminating recovery time. While line losses do occur in this scenario, they are minimized because of the preponderance of low-draw use.


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