Sunamp Heat Batteries

Full nationwide installation service with 10 years warranty

Indirect Water Heater

Sunamp Heat Batteries

Swap out cylinders for hot water on tap for less.

Sunamp Thermino xPlus heat batteries are the space-saving substitute for indirectly heated vented and unvented hot water cylinders and hot water only thermal stores.

The compact xPlus batteries come complete with a standby internal electric heating element to provide a fail safe solution. The Sunamp Thermino xPlus can be used with high temperature heat pumps accepting a volt free hot water signal.

Providing cascades of hot water to comfortably provide a vigorous power shower or hot bath when you need it. With best in class insulation, lower heat losses mean lower carbon emissions.

Available in four sizes which can also be combined, they are the right solution to perfectly match the exact hot water requirements of your property.

Full of Benefits

Indirect Water Heater Sunamp Heat Batteries

Adaptable & Reliable

Works with any heat source and comes with a market leading 10-year warranty requiring no annual maintenance.

Compact Design

Up to four times smaller than equivalent hot water cylinders.


Instant hot water at mains pressure.

Energy Efficient

Extremely low heat losses.


Non-toxic and significantly reduced risk of legionella.


Easily combined to increase storage capacity.


Models Available

Direct Water Heater

Our prices are guaranteed and include removing your old system and fitting your new Sunamp with all the pipe work and extras along with specialist delivery.

Available in four sizes which can also be combined, they are the right solution to perfectly match the exact hot water requirements of your property.

  Thermino 150 Thermino 210 Thermino 300
Thermino Thermino 150 xPlus Thermino 210 xPlus Thermino 300 xPlus
Heat Storage Capacity (kWh)1 7 10.5 14
Equivalent Hot Water Cylinder Size2 142 212 284
V40, Volume of Hot Water Available at 40°C (L) 185 300 370
Standby Heat Loss Rate (kWh/24h | [W]) 0.68[28] 0.77[32] 0.84[35]
Energy Efficiency Rating A+ A+ A+
Heat Power Rating (~230V) 2.8kW 2.8kW 2.8kW
Height (mm) 650 860 1070
Width x Depth (mm) 365 x 575 365 x 575 365 x 575
Installed Price* £4,295 £4,495 £5,375

* Full installation by Accredited Sunamp Installers:

Our full installation service includes supply and delivery using Zonzini to the point of installation plus a full bore isolation valve, all pipe work removal of old pipework (except under floors) and removal of old unwanted header tanks if possible.

This service also comes with a .5L expansion vessel and 22mm Thermostatic blending valve as required by Sunamp to conform with their installation instructions for a valid warranty. For all PV versions the Sunamp Optimino PV key is required and we recommend the My Energi Eddi solar diverter and Harvi to maximise the use of excess PV.

Please note: If you live in a hard water area a water conditioner such as the Hydroflow HS38 needs to be fitted otherwise the Sunamp warranty will be void. The charge for this is £225 plus VAT.

Choose Your Sunamp

Consumer & Trade Suppliers

Nationwide Service

We supply and fit directly to the consumer or supply to the trade throughout the UK so if you are interested in a Sunamp Heat Battery we can help you.

If you are planning to improve your property, you are a housing developer or a landlord. Thermal energy storage technology can cut carbon emissions using efficient eco-friendly heat batteries.

If you are a developer or in the trade it is now time to start thinking about alternatives to the traditional way we would expect to deliver hot water. Working alongside a renewable energy source heat batteries can deliver environmental benefits, save space and improve cost efficiencies.

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Comments From Our Customers

Eco Smart Heat Testimonials

  • Very pleased with Eco Smart Heat. From the initial enquiry through to planning, delivery, installation and handover the service was excellent.

    Rare these days to find such a great company that offer prices that could not be matched anywhere else.

    Steve Kirby
  • Ecosmartheat have fitted a sunamp heater for me. It was done very efficiently, turned up on time etc. Sorted out little problems on the way (getting it to work so that I can use either my existing oil boiler if I want, or the electric, and sorting a problem with the wiring).

    Also much cheaper and more helpful than a nearer supplier.

    Ruth Blake
  • Very Pleased with the fantastic job done by the guys. They installed our Sunamp heat battery in 2 days including removing old heating system, radiators, tanks etc with minimum disruption and a thoroughly professional attitude.

    Excellent problem solving too working out our antiquated old system. Best thing, all the work was covered by the original quoted price, no hidden extras.

    Thanks very much Eco Smart Heat. Highly recommended.

    Vic W
  • Excellent service from start to finish. Contacted Ben who talked me through the process and organised delivery and installation of Sunamp. Even squeezed me in before Christmas, which was very much appreciated.

    Richard came first thing as promised to install, explaining the process of the fit, making sure I was happy with everything. Very friendly and accommodating guys would definitely recommend their service and product.

  • This is a company with great customer service and competitive pricing which provides a service nationwide. From the initial phone call enquiry to having the unit delivered, immersion heater removed & Thermino 150e installed, the email and phone communication was great.

    The installation was booked within 2 weeks. I have now saved loads of space by putting my washer and dryer into the cupboard where my Thermino is. The company also went above any beyond their normal job role by providing and installing an updated timing switch and the installation of a tee valve to relocate my washer.

    David Tomlinson

Why are we better value?

Eco Smart Heat

We charge a fair price for our products and services so perhaps you should be asking our competitors why they cost more than us?

We do not employ pushy sales executives and we do not spend big on marketing. Why? because our prices, experienced team and products sell themselves.

Compare any of our prices against our competitors and you will find us to be better value with a better service.

We are an independent, family run business with engineers that have over 20 year's experience in the industry. If you would like a free survey and a fair price, contact us today.

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