Get to know your Daikin heat pump
Stay cosy and in control with guidance and support on how to use your Daikin heat pump
How to set a schedule
Check out our recommended schedule for the Cosy Octopus tariff.
Getting started: what you need to know
Head back for advice on saving money and how the heat pump works in your home.
Troubleshooting
The radiators will still be warming up your home even if they’re not very hot to touch. If your room is comfortable and the thermostat is the right temperature, then everything’s working fine – even if the radiator is lukewarm or cool. When it’s very cold outside, you’ll notice your radiators get warmer.
If the thermostat looks right but the room still feels a bit chilly, you could:
change the heating schedule, so it’s warm at different times
turn up the target temperature by a degree or two
open the valves and check the system pressure
If things still don’t look quite right
Most issues can be fixed with a little heat pump TLC (maybe the radiators feel colder at the top, or your hot water isn’t as hot as you’d expect). The first things to do are:
Open the radiator valves and bleed the radiators
Check and adjust the water pressure in your heat pump
See the guidance below for tips on how to do this.
If you've done the above, but your heat pump is still not hitting temperature, it might be that the ‘leaving water’ (the water circulating through your radiators and/or underfloor heating) is too cold. You can change that in the control panel settings. See this video for a guide.
Scroll through the main menu and choose ‘main zone’.
Use the right hand dial to raise the temperature slightly and press the left hand dial to confirm.
There are two simple things you can do to keep your radiators in good nick and make sure your heating levels stay stable.
Open the valves
A lot of radiators have thermostatic valves, so you can regulate the heat in each room. They’re very handy, but they can get stuck sometimes.
All you need to do is turn them all the way in each direction before setting them back to where you want.
Bleed any air out of the radiators
You’ll know for sure they need it if they’ve got cold spots at the top. You’ll need a radiator key and a rag or cloth.
Pop the key in the valve and turn it slowly anti-clockwise, holding the cloth underneath, until you hear air hissing out. Hold there until a bit of water spits out (that’s what the cloth is for). Then close the valve again firmly, turning clockwise. Check out this video for a demo.
If you’ve had to bleed your radiators, it’s quite likely your water pressure has dropped. So check that next.
Your heating system relies on water being at a certain pressure to work efficiently. Over time, the pressure can ease down, like air from a car tyre. It can also be affected if you change anything, like bleeding the radiators. Here’s how to keep it in good shape:
Make sure the system is cold before you start
Switch off the heat pump, and let the pipes cool down.
Check the cold water pressure
There’s a pressure gauge attached to the pump, or you can use the control panel. When the system is cold, the pressure should be between 1 and 1.5 bar.
If it’s lower than 1 bar, top up the system with water
This is the hands-on bit. When you look at the heat pump, you’ll see a section with either a lever or flat-headed screws at either end of a flexible, braided hose. This is your filling loop.
You’ll need to turn the levers or screws slowly to let water into the system. Two things to remember:
Make sure the pump’s off and the water in the system is cold
Turn the levers or screws one at a time
They only need a quarter-turn. Keep your eye on the pressure gauge as the water is flowing in.
As soon as the gauge reaches 1 bar, shut the levers or screws off again. You don’t want the system pressure going too high.
Note: when your pump is on and the water is hot, you might see a higher pressure. That’s nothing to worry about: it goes up and down a bit while it’s working. But if the cold water pressure falls lower than 1 bar, the system won’t work as well as it should.
It’s most likely defrosting. When it’s cold, your pump will automatically run a cycle to clear any built-up ice . It’s actually steam, not smoke, and a bit of melted ice. So it might look a bit dramatic, but it’s actually a sign everything’s working as it should be.
The short answer is that it didn’t finish disinfecting the hot water in the tank. Leave it a week, and it should run another cycle and clear the error. If it hasn’t by day 8, give us a call.
The long answer: once a week, your hot water cylinder runs a disinfection cycle. That should happen some time when you’re unlikely to run the hot water, like in the early hours. But if someone, say, runs a bath during that time, it stops the process. And that shows up as a warning until it runs the next cycle. Don’t worry: skipping a week won’t cause any problems.
If you've changed Wi-Fi router or internet provider, and your Daikin app has been disconnected from the internet, follow the steps on this guide to re-establish your Wi-Fi connection and get your heat pump back online.
Still feel like something’s not right? Get in touch.
Submit a support request: here
Call us: 0808 196 6842
Our aftercare phone lines are open 9am – 5pm Monday to Thursday & 9am - 4pm Friday
There are other ways to get in touch too.
If you'd like to raise a formal complaint, find our complaints procedure here.
If you have an emergency between 8am–9am (Mon–Fri), 5pm–8pm (Mon–Thu), or 4pm–8pm (Fri), please call 0808 164 1088 or email emergency@octopus.energy with the word "emergency" in your we’ll pick it up as a priorityMore emergency info click here
How to use your heat pump controls
Check out our video guides for more support with your Daikin heat pump controls.
How to use your thermostat
How to set a schedule with your Daikin control panel
Downloadable user guides
Cosy heat pump customers on the Cosy Octopus tariff saved an average of £224 last year compared to using a gas boiler running at 85% efficiency on our standard variable tariff
This figure is based on the actual energy consumption of all Cosy heat pump customers on a Cosy Octopus tariff between 1 July 2025 and 1 July 2026, using tariff rates at the time.
We compared this to the cost of producing the same amount of heat with a gas boiler operating at 85% efficiency, priced using our Flexible Octopus (standard variable) tariff at the same time.
Savings from gas standing charges were included only for customers who had fully removed their gas supply (less than 3% of customers). Actual savings vary depending on system design, tariff choice, home insulation, and energy use.
Our typical heat pump price is £4,459, which is lower than the national average of £5,600
This is the median post-survey price from all of our heat pump quotes after the £7,500 Boiler Upgrade Scheme has been applied, between 01/09/2025 and 28/02/2026. The national average is taken from the Boiler Upgrade Scheme statistics: April 2026 – median cost of installation Q4 2025.
Cut carbon emissions by 82% with a heat pump
This is the typical reduction in heating carbon emissions using an electric powered heat pump compared to a gas boiler.
The carbon breakdown
Gas CO2 (tonnes per year) - 2.42
Electricity CO2 (tonnes per year) - 0.43
Carbon saving (tonnes per year) - 1.99
Data sources and assumptions
Gas Energy Usage (kWh) 11500 (Ofgem medium use gas usage (Jun 2026))
Heat Pump Efficiency 312% (typical seasonal coefficient of performance from a fleet of Octopus high temperature heat pumps)
Gas Boiler Efficiency 85% (The typical gas boiler efficiency from a BEIS study)
Gas fuel emissions of (gCO2/kWh) 210 (SAP 10.2)
Electricity fuel emissions of (gCO2/kWh) 136 (SAP 10.2)
Based on these sources, heat pumps typically produce lower operational emissions when heating the home than gas boilers.
For more information, explore our Octopus Cosy heat pump fleet performance dashboard.
We're the largest heat pump installer on the Boiler Upgrade Scheme
Based on Octopus benchmarking against Ofgem reports from 2024, and we've continued to grow since.
Our customers love their heat pumps!
- 93% of people say it's the same or more comfortable than their previous boiler
- 87% say it costs the same to run or less
- 83% say it's the same noise or less than the previous boiler
- 90% say it's just as easy or easier to maintain
We survey all our heat pump customers 3 months post-installation to see how they find their heat pump compared to their previous gas boiler. Survey results are taken from a sample of 2,837 customers:
Comfort: 93% of people say it is the same or more comfortable than their previous boiler.
Running Costs: 87% say it costs the same to run or less.
Noise: 83% say it is the same noise or less than the previous boiler.
Maintenance: 90% say it is just as easy or easier to maintain.
A heat pump is around 4x more efficient than a gas boiler
Heat pumps don't generate heat by burning fuel. Instead, they transfer existing heat into your home. This means they can deliver multiple units of heat for each unit of electricity used.
Based on performance data from a fleet of installed Octopus Cosy heat pumps, typical real-world seasonal performance (SPF or SCOP) is around 3.6. This means around 3–4 kWh of heat is delivered for every 1 kWh of electricity used (an effective efficiency of 300–400%). By comparison, typical UK domestic gas boilers operate at around 85% efficiency, delivering approximately 0.85 kWh of heat per 1 kWh of gas used. On this basis, a heat pump can be around 4× more efficient than a typical gas boiler.
All our heat pumps are independently tested by the Building Research Establishment (BRE), with SCOP values published on the Microgeneration Certification Scheme (MCS) product database. Actual efficiency will vary depending on the property, system design, and usage. For more information, explore our Octopus Cosy heat pump fleet performance dashboard.
The UK's most awarded energy supplier
We've won more awards for customer service than anyone else.
Heat pumps give reliable, consistent heating and hot water
The heat pump user survey report by Nesta from May 2023 summarises that "users are highly satisfied with their heat pumps". It states: "People living in England, Scotland and Wales who own their home and use a heat pump to heat it are satisfied that heat pumps are safe, reliable, quiet heat sources that are effective for space heating and producing hot water." Find the full report here.
The Cosy heat pump is quiet
Heat pump sound power levels are verified by an independent, third-party laboratory as part of the testing process for inclusion on the MCS product database. The laboratory verifies the sound power on the A-weighted decibel curve, as A-weighting closely aligns to how humans perceive "loudness".
All heat pumps are measured using EN14511 standards to ensure uniformity across manufacturers and models. Our Cosy 6 heat pump has a verified sound power level lower than many other heat pumps of the same capacity.
Heat pump heating makes the air healthier in your home
Homes with a heat pump emit far less harmful nitrous oxide (NOx) emissions than those with gas boilers and cookers, significantly reducing asthma and other respiratory illnesses. According to the Sustainable Markets Initiative Cleantech Homes report.
A heat pump can add thousands to your property value
Analysis by the Department of Land Economy at the University of Cambridge suggests a 16% value uplift for new-build homes with enough solar and battery storage to eliminate energy bills. A further study of over five million existing properties indicates a 2-3% value increase for existing homes with solar panels or heat pumps (versus like-for-like gas-heated homes), according to the Sustainable Markets Initiative: Cleantech Homes report, 2024.
As of April 2025, the average house price in the UK is £265,497 according to the Land Registry. Therefore, a 2-3% value increase for an average house priced at £265,497 would be between £5,310 and £7,965.
Heat pumps typically last longer than gas boilers
The expected lifespan of a typical gas boiler is 10–15 years. A heat pump typically has a lifespan of 15–20 years, with UK government research indicating an average of around 20 years. Manufacturer Daikin reports similar ranges. Actual lifespan depends on factors such as installation quality, maintenance, usage patterns, and operating conditions.