Air Source Heat Pumps

The heat is there – let’s use it!

The benefits of using a Stiebel Eltron air source heat pump (ASHP)

Air source heat pumps harvest the sun’s heat from the air. A refrigerant circuit extracts heat as air is passed through the heat pump. We only use the highest quality air source pumps which are efficient enough to produce all your heating and hot water needs even when the air temperature outside is  -20°C. Stiebel Eltron Air Source Heat Pumps can produce water at 65°C without any supplementary energy source.


Air source heat pumps are very efficient, with every unit of electricity used it can produce between 3 and 4 units of heat.
As they do not require collection loops or inside installation, air source pumps are an ideal solution where space is an issue. For the same reasons they typically carry a lower cost of installation than a ground source. Because such a high proportion of the heat output from a heat pump comes from a sustainable environmental source, CO2 emissions are substantially lower than traditional fossil fuel systems. This helps to reduce your carbon emissions and save the planet

Is an air source heat pump suitable for my home?

Older homes which have been refurbished with modern levels of insulation or new build houses are ideal candidates for heat pumps. However it is possible to design effective systems for older, poorly insulated properties, but special care needs to be taken in the system design (perhaps using an existing boiler in tandem for the coldest few days of the year) and upgrades to your radiators may be necessary. We have experience designing and installing successful heat pump systems in listed and heritage properties and can advise you on your options. If you are replacing an LPG or oil heating system on an older property then there are substantial financial benefits from fuel savings, and RHI payments to be made.

Do you have somewhere to put it?

For a typical outside installation, you will need a space with plenty of clearance for air flow. The unit does not need to be positioned immediately adjacent to the building.
We also supply a range of air source heat pumps that can be installed internally if planning constraints apply or it is your aesthetic preference.

What is a buffer tank for?

For fault-free operation, heat pumps require a minimum flow rate of heating water. We recommend using a buffer cylinder in order to ensure trouble-free heat pump operation. Amongst other things, buffer cylinders provide hydraulic separation between the heat pump circuit and the heating circuit. For example, if the flow rate in the heating circuit is reduced via thermostatic valves, the flow rate in the heat pump circuit remains constant.

For air source heat pumps the need for a buffer is even greater than for ground source pumps. The heat exchanger in air source pumps runs much colder than ambient temperatures, and as a result it becomes frosted with ice. Air source pumps must periodically work in reverse to defrost the exchanger. A buffer tank provides a source of heat to steal for this purpose, without robbing heat from the property being heated. Without this dedicated store of heat, an air source machine can start to take heat from a house, actually reducing the temperature of the property in a downward cycle.

Heat pumps, like cars, are less efficient if they start and stop frequently. Buffer tanks allow a pump to run for longer periods of time increasing efficiency. If a single room calls for heat it can use energy stored in the buffer tank first, delaying the need to start the pump again.

Why choose a system by Total NRG?

Total NRG is a family run business with a high quality ethos. To provide our clients with practical and efficient solutions, which match their specific requirements, we manage the whole process from beginning to end

“For over a decade Bryan Jones has been a leading light in the drive to promote renewable energy in the UK.
While working as a heating engineer, Bryan came to understand the importance of the energy we use for modern life and the effect it has on our planet. He became passionate about exploring the alternatives to fossil fuels that were available in his industry and founded Total NRG to bring these alternatives to his customers.”

Bryan Jones

Managing Director 

Our Experience

With over 10 years’ experience in both domestic and commercial sectors, Total NRG has a proven track record of excellence in the design, planning, and installation, of renewable technologies across the UK.


Lower Running Costs

Heat pumps are cheaper to run than systems based on combustion (LPG or Oil) The more energy efficient the systems are, the greater long-term savings on energy.


Carbon Emissions

Heat pump system reduces your carbon emissions via an efficient conversion rate of energy to heat achieving up to 400% efficiency.


Less Maintenance

Heat pumps do not require a flue for combustion, so there is no danger of carbon monoxide



Long Life-Span

The life-span of Stiebel Eltron heat pumps is somewhere between 20 to 25 years. This comes with a 7-year manufacture warranty when designed and installed by Total NRG



Stiebel Eltron Air Source Heat Pumps (ASHP) will work down to -20°C still giving you 65°C without the need for an immersion heater, this will provide all your hot water & heating demands all year round, it’s the quietest on the market, unlike some other heat pumps on the market.


RHI Scheme

The government provides two different types of programs to assist the installation of renewable heat systems. You may be eligible for payment under Domestic Renewable Heat Incentive (RHI) scheme, which addresses to homeowners, social and private landlords, and also to self-builders. On the other side, the Non-Domestic Renewable Heat Incentive is open to public sector such as businesses, organisations and industries.


Remote monitoring

Stiebel Eltron ISG is for online remote access, this enables you or Total NRG to change programs or setting, and also will send a text or email to Total NRG or you of any problems.


Other Services

With over 10 years’ experience in both domestic and commercial sectors, Total NRG has a proven track record of excellence in the design, planning, and installation, of renewable technologies across the UK.

Ground Source Heat Pumps

Renewable energy from the ground to heat homes from a sustainable source.

Solar Photovoltaic

Generate and use 100% of the electricity you generate with a Total NRG solution.

Underfloor Heating

Reduce heating bills and increase usable space with an even heat distribution.


Satisfaction Guaranteed