How long does a Sunamp heat battery last?

When you’re investing in a new hot water system, it’s only natural to wonder how long it’s going to last. Whether you’re replacing a traditional hot water cylinder or choosing a new hear battery for the first time, longevity is one of the biggest factors to consider.

The reassuring news is that Sunamp heat batteries have been designed with an exceptionally long service life in mind. In fact, the technology at the heart of every Sunamp has undergone more testing than almost any other thermal storage product on the market.

A different way of storing heat

Unlike a conventional hot water cylinder, a Sunamp doesn’t store litres of hot water waiting to be used. Instead, it stores energy inside an advanced Phase Change Material (PCM) called Plentigrade®. When electricity is available, the PCM absorbs and stores that energy. When you turn on a hot tap, the stored heat is released almost instantly to produce fresh hot water.

Every time the material is charged and then discharged is known as a cycle. Most households will typically use around two cycles per day, although this will vary depending on how much hot water is being used.

The important question is how many of those cycles the material can withstand before its performance starts to decline.

Independently proven to last

This is where Sunamp really stands apart. Sunamp is the only heat battery manufacturer in the world to have been awarded A Grade RAL Certification for its phase change material. RAL is an independent quality mark and the only globally recognised standard for phase change materials and PCM products. Rather than relying solely on manufacturer claims, the certification provides independent verification that the material performs exactly as intended.

To achieve this accreditation, Sunamp’s PCM was tested through 10,000 complete charge and discharge cycles, with no noticeable degradation in performance. For a typical household using around two hot water cycles per day, that’s the equivalent to well over 13 years of everyday use.

It doesn’t stop there

While the independent certification confirms performance to 10,000 cycles, Sunamp has continued to test its products in-house. These long-term laboratory tests have now exceeded 40,000 cycles, with the material continuing to perform safely and reliably. That’s comparable to more than 50 years of continuous daily use at two hot water cycles per day.

Of course, no manufacturer can promise that every installation will still be operating half a century from now. Plumbing systems change, homes are renovated, and technology evolves. However, these results demonstrate just how robust the phase change material itself really is.

What about the rest of the system?

Like any heating appliance, there are components that may eventually require maintenance or replacement during the lifetime of the product. Electronic controls, sensors, or other plumbing components won’t necessarily last as long as the PCM.

The key difference is that the thermal storage material – the part that actually stores the energy – has shown remarkable long-term stability. It’s one of the reasons why so many homeowners, installers, and developers choose Sunamp for projects where reliability is just as important as efficiency.

Does a Sunamp need servicing?

Another advantage of a Sunamp heat battery is its simplicity. Sunamp doesn’t store domestic hot water in the same way that a traditional cylinder does, so there are fewer concerns associated with stored water, and there are very few moving parts inside the unit itself. This means there’s generally very little routine maintenance required, although any connected heating system should always be maintained in accordance with the relevant manufacturer’s guidance.

For many homeowners, a Sunamp simply becomes one of those products that quietly does its job every day without needing much attention.

A long-term investment

Buying a new hot water system isn’t something most people do very often, so it’s worth choosing one that’s built to last. Sunamp’s combination of independent certification and extensive in-house testing provides a level of reassurance that’s difficult to match. Being the only heat battery manufacturer in the world to achieve A Grade RAL Certification for its PCM demonstrates the confidence the company has in its technology, while testing beyond 40,000 cycles suggests the core thermal storage material is capable of providing reliable performance for decades.

If you’re looking for a compact, energy-efficient alternative to a traditional hot water cylinder, it’s good to know that a Sunamp isn’t just designed to save space and reduce energy use, it’s also designed to stand the test of time.

Frequently asked questions

How long does a Sunamp heat battery last?

Independent testing has shown no noticeable degradation in the phase change material after 10,000 charge and discharge cycles, which is equivalent to more than 13 years of typical domestic use. Sunamp’s own testing has now exceeded 40,000 cycles, representing over 50 years of continuous use at two cycles per day.

What makes Sunamp different from other heat batteries?

Sunamp is currently the only heat battery manufacturer in the world to achieve A Grade RAL Certification for its phase change material. This independent certification confirms the long-term durability and performance of the thermal storage material.

Does the heat storage material wear out?

All materials will eventually age, but independent testing has shown no noticeable degradation after 10,000 cycles, while Sunamp’s own testing has continued beyond 40,000 cycles with reliable performance.