Frequently asked questions

Frequently asked questions about our domestic hot water products

Below are some of the most frequently asked questions about our domestic hot water products. 

The answers cover both the third-generation Uniq and the new, fourth-generation Thermino heat battery ranges.

Sunamp heat batteries can be fitted by a qualified plumber or electrician in accordance with the relevant instruction manual, where you will find also additional product information. Search our list to find an approved stockist and installer near you.

The Sunamp product warranty states that you must be a competent person to install a thermal battery. This means that we do not demand any specific training courses, however it is expected that you have the required qualifications, knowledge, training and experience to be able to understand the basic plumbing and electrics to install something like an unvented hot water cylinder. 


Our product manuals give clear installation guidance. You’ll find the installation manuals on each product page on this website. We also have instruction videos on our YouTube channel

Our batteries connect with mains electricity and many other heat sources, including heat pumps, solar PV and boilers. They are ideal space-saving replacements for traditional hot water cylinders.

As we are often asked this, Sunamp batteries do not connect to solar thermal units, pellet, oil or wood burning stoves, swimming pools or hot tubs.

Yes. Specific models in the Sunamp Thermino and Uniq battery ranges are compatible with heat pumps from Daikin, Samsung and Vaillant. 

We have tested the ability of the heat pumps from these manufacturers to meet the flow temperatures requirements of the heat battery (63-65 degrees Celsius).

The Thermino range comes in different sizes and configurations depending on the desired application. Please see the prices offered by Sunamp’s approved stockists and installers who can help you further.

Search the list to find one near you.

Running costs depend on many different factors unique to your home. 

For example, electricity tariff, energy usage, energy source, frequency of usage, ambient temperature versus indoor temperature and heat battery size.

Sunamp does not sell directly to homeowners. Our products are available through our approved stockists who will be happy to help you. 

Any direct sales enquiries received from individuals are forwarded to our installer and distributor network. Search here to find an installer or stockist near you.

Yes. We recommend a Thermostatic Mixing Valve (TMV) since the hot water output of the heat battery is at 55 degrees Celsius and therefore, there is a high risk of scalding if a TMV is not fitted.

Yes. We recommend you use a water conditioner, such as a HS38, to keep limescale in the water to under 150 ppm. It can be used with any size heat battery.

Please refer to our product data sheets and installation manuals. 

You’ll find them on each product page on this website.

You can register any of our hot water products by clicking this link

For general enquiries, please email 

For technical enquiries, please email 

Please include all details of your enquiry and relevant product warranty information. We will respond to all enquiries in clear and friendly manner within two working days.