Free-E PV management system
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Dimplex Free-E: Free domestic hot water from Solar PV

Dimplex Free-E is a clever wireless energy management system that works with a solar PV installation to heat the domestic hot water tank for free. Free-E does this by monitoring a household’s energy usage accurately and diverting surplus energy to the hot water tank’s immersion heater, instead of back to the grid.

By making use of the surplus energy generated by the PV system, a household could use an additional 70% of the energy generated, this could result in a significant reduction in energy bills.

Free-E does this without affecting the revenue from the Feed-in Tariff (FiT) or the 50% export Tariff*. So, homeowners still get paid for energy generated while maximising their usage too.

Free-E is 97% efficient at automatically converting PV energy to hot water. There is no need to remember to switch appliances on to use up the solar generated energy. Even on cloudy days, Free-E can utilise up to 97% of the electricity of the generated within a home.

Free-E can be fitted retrospectively to homes with an existing solar PV installation or as part of a package with a new PV installation – no matter which PV system is used. It can also be used with other microgeneration systems such as hydro or microwind. And there is no need for the homeowner to change their current hot water tank or electrical supply.

The Free-E wireless energy management system comprises two parts,

1. The Energy Meter sits adjacent to the incoming mains supply. It will typically be installed next to the fuse box. This monitors the flow of electricity and transmits this information wirelessly to the Free-E unit.

2. The Free-E unit sits next to the hot water tank. If surplus energy is available, it will divert this free energy to the immersion heater, rather than giving it away to the national grid. As a result, some of the household’s hot water is heated for free.

Key features:


Quick and easy to install - As long as there is a hot water tank with immersion heater, there is no need for any replacement. Intuitive commissioning allows for simple set-up, while a self-check feature confirms correct installation of the Energy Meter. An intelligent self-protection system prevents over-current and overheating. Plus, wireless communication – using 868 IBM band with listen-before-talk technology – allows trouble-free installation of multiple systems in a small area. Typically installed by an electrician in a couple of hours – no mess and no fuss.


Wireless - No lengthy or unsightly cables are involved. The Energy Meter also runs on mains electricity, ensuring reliable, uninterrupted communication for trouble-free and low energy use without having to replace batteries.


Automatic - Free-E adjusts the flow of energy to the immersion heater automatically as home consumption varies. This ensures only excess generated power is used to heat the domestic hot water tank. Even on cloudy days, Free-E adjusts the immersion consumption quickly to ensure it only uses free electricity


Easy to use - No need to monitor the system once installed – simply enjoy using free hot water. However, a clear back-lit display shows the PV generation breakdown for the property of export, import and energy used for hot water generation, if required.


Peace of mind - Free-E is made from high-quality components but, in the unlikely event of a problem, every Free-E comes with a three-year warranty for complete peace of mind.


Compliant - Unlike many other systems, Free-E uses innovative technology to ensure it does not create any electronic interference. Therefore, it is fully compliant with European regulations (EMC).

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