Home energy technologies are developing all the time. Companies come up with new technologies, or new features for existing technologies, or just new ways to use the systems we already have. And new evidence is emerging all the time on how well systems work, when they make sense and when they don’t.
We’re always looking for hard evidence to evaluate every new idea, so we can include any successful innovations in our advice. Here are some recent innovations, and a few that have been around for a while but which we haven’t been able to verify yet.
We plan to update this page as we get new evidence.
Page last updated 30/11/2018.
Air source heat pumps are a fairly well established technology, but their efficiency can drop significantly if they have to draw heat from particularly cold air, or provide heat at a particularly high temperature. A hybrid solar heat pump uses a solar thermal collector to preheat the air before it enters the heat pump, so the heat pump can then produce water at a relatively high temperature without having to work too hard. This is ideal for producing domestic hot water.
The principle is entirely sound, and the heat pump should operate at a high efficiency and so use only a small amount of electricity. But we don’t have any independent performance data to estimate what the running costs would be and how this would compare to the cost of buying and installing a system.
You should bear in mind that the average household bill for providing hot water is around £80 a year, so if you buy a hybrid solar heat pump that only produces domestic hot water it can’t save more than this on your fuel bills.
These are different to hybrid solar heat pumps. They are conventional heat pumps, but with a secondary heat source alongside, usually a gas or oil boiler. The idea is that you can switch to using the boiler instead whenever the heat pump is unable to provide all the heating requirement, or to operate at a reasonable efficiency.
Some people describe these as bivalent systems, but that name can be used for any heating system that uses two different fuel sources.
We can’t currently advise whether there are any situations where it would be better to fit a hybrid heat pump rather than a heat pump on its own or a gas or oil boiler on its own.
PVT is another hybrid system, but this time it’s a solar PV panel (to generate electricity) with a solar thermal panel (to produce hot water) underneath. The theory says that the solar thermal panel draws heat from the PV panel, which cools it down and makes it more efficient, so you get more electricity generated while also getting some hot water. The hot water will have to be relatively low temperature though if it’s going to significantly affect the PV efficiency.
Sometimes it can be difficult to make sure you’re switching to the best deal for your energy supply if you’re not exactly sure how much energy you’re using. And this is going to get harder still as energy suppliers develop new variable tariffs that charge different rates at different times.
So why not buy a robot to monitor your energy use and do the switching for you? Systems like this are now coming onto the market.
Read our guide to solar panels, the benefits of generating renewable energy from sunlight, how it works, how to install them and how much you could save on your energy bills.Solar panels
All you need to know about air source heat pumps, including the different types of pump, how to maintain them as well as the potential costs and savings.Air source heat pumps
Read our guide to switching utilities to make sure you're getting the best value for money from your energy supplier.Switching utilities