Air to Water Heat Pumps – The sensible approach to heating and hot water


The terminology around the arrival of various types of heat pump are getting more familiar to most of us. And air to water heat pumps are no longer solutions from another planet.

With far too few installers currently qualified to install heat pumps in the UK – and a potential need for more than 30,000 to meet the Government’s target of 600,000 installations a year by 2028, you’ll forgive us for talking at the basic level to try and get the heat pump message across. It’s a potentially highly lucrative area of business for installers and no installer who will still be working in the heating sector in ten years time is going to pass up the chance to get to know more about them.

Installers who see heat pumps as an essential part of their future know that an air-to-water heat pump transfers heat from the outside air to water, which heats your radiators or underfloor heating. It can also heat water stored in a hot water cylinder for your hot water, showers and baths. Heat from the air is absorbed into a fluid. This fluid then passes through a heat exchanger into the heat pump, which raises the temperature and then transfers that heat to water.

Air-to-water heat pumps are suitable for many types of homes and are the most common type of domestic heat pump, with tens of thousands of installations already across the UK. This includes thousands of installations that have used the LG Therma V range of air to water heat pumps.

There are two types of air-to-water heat pumps available from LG: monobloc and split systems. A monobloc system has all the components in a single outdoor unit, with pipes carrying water to the central heating system and a hot water cylinder inside your home. A split system separates the components between indoor and outdoor units. Whether a monobloc or split system is the right solution for you will firstly depend on your budget and secondly, on the space available outside the property.

Monobloc systems tend to be cheaper and quicker to install and don’t take up as much space in a home. The efficiency gain from split systems comes from some of the heat transfer taking place inside the building where it is warmer, rather than outside.

Heat pumps really are a lot less complex than many imagine, and problems with them are surprisingly rare for what is still for many installers a new technology to get to grips with. But the reality is that heat pumps have been around for several decades – just not in the UK where the love affair with the combi boiler has seen the use of fossil fuels in preference to renewable heating. The rising awareness of the issues of climate change have seen the need to switch away from fossil fuel – gas, oil and solid fuel – burning, to the use of renewable options – such as wind, solar and hydro power if we are to save the planet.

LG’s air to water heat pumps have been rapidly gaining fans over the past few years and LG’s well recognised branding from TVs, mobile phones and fridges and other white goods has seen homeowners receptive to what the company offers on the heating front making it an easier sell for installers. LG is a massive company and invests heavily in research and development – so the equipment they sell is of high quality and features a number of areas of technology that have been devised and developed by LG itself and incorporated in its latest technology for heating here in the UK. Not surprisingly when you look at its consumer products, LG equipment is renowned for the leading edge controls that come with their equipment, making it easy and quick to control the heating equipment – and from anywhere in the world via its apps – even using voice recognition technology in the home via Google Homes.

Installers and their customers will love the latest addition to the LG Therma V family – the new Monobloc ‘S’ – the all-in-one concept and reduced weight of the unit makes for easier and quicker installations. The new version requires lower amounts of refrigerant compared to the existing model – 16.7% less in fact – reducing emissions and lessening its environmental impact still further. The new version features LG’s revolutionary R1 Compressor technology which offers advanced efficiency, reliability and operational range due in part to the enhanced tilting motion of the scroll. It offers enhanced operational range – up to 135Hz, a shaft-through structure and support at both ends of the shaft which ensures higher durability and offers bottom compression and simple structure that offers lower noise and vibration, less weight and superior reliability.

The unit comes with a Seasonal Coefficient of Performance of up to 4.67 (Average climate/Low temperature application) and a A+++ rating. The COP rises to 4.9 (Outdoor air 7°C/Leaving water temperature 35°C) and can deliver leaving water temperature of 65°C if required.

For more information on LG Renewable Heat Solutions, please visit:

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