Quick answer: A Panasonic heat pump is a strong choice for most homes. The Aquarea L Series runs on R290 natural refrigerant, reaches flow temperatures of up to 75°C, and posts SCOP figures of up to 5.06 at 35°C. The older K Series (R32) is still sold but tops out at 60°C, so for most Scottish retrofits I’d point you towards the L Series first.
Panasonic is a very popular brand with installers and we get asked about it a lot. This review is based on Panasonic’s own technical data, UK datasheets and trade press, written the way I’d explain it on a survey visit.
Panasonic Heat Pump Review: At a Glance
The Panasonic Aquarea L Series is the one to look at for most homes: R290 refrigerant, 5kW to 9kW sizes, and up to 75°C water. Here are the headline figures.
| Feature | Panasonic Aquarea L Series |
|---|---|
| Brand | Panasonic |
| Main domestic range | Aquarea L Series (also called L Generation) |
| Sizes | 5kW, 7kW and 9kW (single phase) |
| Configurations | Hydraulic split (bi-bloc) with separate cylinder, or All in One with a built-in 185 litre tank |
| Refrigerant | R290 (propane), GWP of 3, sealed inside the outdoor unit |
| Maximum flow temperature | Up to 75°C, still reachable at -10°C outdoors |
| SCOP at 35°C (average climate) | 4.84 to 5.06 (ErP A+++) |
| SCOP at 55°C (average climate) | 3.62 to 3.67 (ErP A++) |
| Heating operating range | Down to -25°C outdoors |
| Outdoor sound power | 52 to 54 dB(A) |
| App | Aquarea Smart Cloud, now run through the Panasonic Comfort Cloud app |
| Warranty | Up to 7 years through a Panasonic PRO Partner installer, with annual servicing |
| Home Energy Scotland grant | Up to £7,500 (£9,000 with the rural/island uplift) |
| Best for | Older homes with radiators, and homes that want the hot water tank indoors in a compact unit |
Is a Panasonic Aquarea Heat Pump Worth It?
Yes, for most households a Panasonic Aquarea L Series heat pump is worth it. It pairs a natural refrigerant with a high 75°C flow temperature and very respectable efficiency, which is exactly what older Scottish homes tend to need.
The design choice I like most is the way the L Series is put together. All of the R290 refrigerant stays sealed inside the outdoor unit, and only water pipes run into your house. Panasonic calls this a hydraulic connection. There’s no refrigerant pipework through your walls, and the indoor unit can sit up to 30 metres from the outdoor unit.
The 75°C figure matters in Scotland. Plenty of the stone-built villas and tenement flats we survey in Edinburgh, Musselburgh and Perth have radiators sized for a gas boiler, and running hotter on the coldest days gives you headroom. I’d still design it to run as cool as possible, as that’s where the savings are.
There is a Scottish example in the trade press, too. In late 2023 a couple in a Highlands bungalow had an L Series All in One fitted, connected to their existing radiators and alongside solar panels. The tank went in their garage, and early on they reported better hot water and shower pressure. They hadn’t yet had a full winter with it, so treat that as a first impression.
Pros and Cons of Panasonic Aquarea Heat Pumps
| Pros | Cons |
|---|---|
| R290 natural refrigerant with a GWP of just 3 | L Series stops at 9kW, so bigger homes need the M Series T-CAP |
| Up to 75°C flow temperature, even at -10°C outside | The 7-year warranty depends on your installer’s Panasonic status and yearly servicing |
| Refrigerant stays outdoors; only water pipes come inside | Outdoor unit weighs around 98kg, so it needs a solid base |
| Compact All in One with a 185 litre tank on a 598 x 600mm footprint | K Series (R32) only reaches 60°C, which is less forgiving with older radiators |
| Strong SCOP figures, up to 5.06 at 35°C | Little heat pump-specific owner review data to go on |
| App control and energy monitoring included | Large 9kW model needs 28mm primary pipework |
How Efficient Are Panasonic Aquarea Heat Pumps?
Panasonic Aquarea heat pumps are very efficient. The L Series has a SCOP of up to 5.06 at a 35°C flow, which means roughly 5 units of heat for every unit of electricity over a typical year. At a 55°C flow, which is closer to what an older radiator system needs, the figure is around 3.6.
SCOP is seasonal efficiency: the higher it is, the less electricity you buy. Panasonic also publishes “cold climate” figures, which I think are a sensible, conservative guide for a Scottish winter. The table below shows both.
| Model | SCOP 35°C (average climate) | SCOP 55°C (average climate) | SCOP 35°C (cold climate) | SCOP 55°C (cold climate) | ErP rating (35°C / 55°C) |
|---|---|---|---|---|---|
| L Series 5kW | 5.06 | 3.63 | 4.25 | 3.28 | A+++ / A++ |
| L Series 7kW | 4.96 | 3.62 | 4.25 | 3.29 | A+++ / A++ |
| L Series 9kW | 4.84 | 3.67 | 4.31 | 3.33 | A+++ / A++ |
| K Series 3kW | 5.07 | 3.47 | n/a | n/a | A+++ / A++ |
| K Series 5kW | 5.12 | 3.63 | n/a | n/a | A+++ / A++ |
| K Series 7kW | 4.90 | 3.62 | n/a | n/a | A+++ / A++ |
| K Series 9kW | 4.44 | 3.41 | n/a | n/a | A+++ / A++ |
| M Series T-CAP 9kW | 5.00 | 3.50 | n/a | n/a | n/a |
| M Series T-CAP 12kW | 4.73 | 3.65 | n/a | n/a | n/a |
| M Series T-CAP 16kW | 4.75 | 3.70 | n/a | n/a | n/a |
Here’s what that means in money. With electricity at around 26p/kWh under the Ofgem price cap for 1 October to 31 December 2026, a heat pump running at a seasonal efficiency of 3.6 delivers heat for roughly 7p per kWh. A gas boiler at 90% efficiency, with gas at around 8p/kWh, works out at nearly 9p per kWh of heat. These are unit-rate sums only, ignoring standing charges, but they show why a low flow temperature matters. Our guide to running costs in Scotland goes into much more detail.
Panasonic Aquarea Air Source Heat Pump Models
Panasonic sells three main Aquarea families for homes: the L Series on R290, the K Series on R32, and the larger M Series T-CAP on R290. Each comes in more than one configuration, which can be confusing, so here’s how they line up.
| Model | Refrigerant | Sizes (kW) | Max flow temp | Notes |
|---|---|---|---|---|
| Aquarea L Series hydraulic split (bi-bloc) | R290 | 5, 7, 9 | 75°C (at -10°C outdoors) | Sealed outdoor unit, water pipes to a wall-hung indoor unit; separate hot water cylinder |
| Aquarea L Series All in One | R290 | 5, 7, 9 | 75°C (at -10°C outdoors) | Indoor unit with built-in 185 litre stainless steel tank, 598 x 600mm footprint |
| Aquarea K Series High Performance bi-bloc | R32 | 3.2, 5, 7, 9 | 60°C | Refrigerant pipework runs between outdoor and indoor units |
| Aquarea K Series All in One (High Performance and T-CAP) | R32 | 3.2 to 9 (HP), 9 to 12 (T-CAP) | 60°C (at -10°C outdoors) | Built-in 185 litre tank; T-CAP holds output in very cold weather |
| Aquarea M Series T-CAP | R290 | 9, 12, 16 (larger 20 to 30kW three-phase units also listed) | 75°C (at -15°C outdoors) | Stand-alone outdoor unit with control module, hydraulic split, or All in One; 9kW and 12kW come in single phase |
A word on jargon: “monobloc” usually means all the refrigerant lives in the outdoor box. That’s effectively how the L and M Series work, although Panasonic calls them “hydraulic split” or “bi-bloc” because a separate indoor unit handles the water side. The K Series is a true refrigerant split.
For most homes we’d be choosing between the L Series bi-bloc with a separate cylinder and the L Series All in One. The All in One is lovely where there’s a decent utility room or garage; the bi-bloc suits homes where the cylinder needs to go elsewhere. Our guide on what size heat pump you need explains how we size the system.
The Aquarea Smart Cloud App
Panasonic’s app for homeowners is Aquarea Smart Cloud, which Panasonic now delivers through its Panasonic Comfort Cloud app. It lets you control your heating and hot water from your phone, tablet or computer, set schedules and keep an eye on energy use.
The L Series and K Series were designed with a dedicated space on the front of the indoor unit for the cloud adapter, and the M Series All in One comes with a Wi-Fi adapter included. A separate installer tool, Aquarea Service Cloud, lets an approved engineer check your system remotely, which can save a wasted visit.
How Much Does a Panasonic Aquarea Heat Pump Cost?
The Energy Saving Trust puts the typical cost of installing an air source heat pump at around £14,000 before grants. A Panasonic Aquarea system will sit somewhere around that, depending on the model, the cylinder and how much work your radiators and pipework need. Your price is fixed after a survey.
For a sense of the hardware alone, one UK merchant lists the L Series 5kW outdoor unit at around £3,100 including VAT. That doesn’t include the indoor unit, cylinder, controls, radiators, electrics, commissioning or labour, which is where most of the cost of a full installation goes.
The good news is that Scottish homeowners get very good support:
- Home Energy Scotland grant: up to £7,500 towards an air-to-water heat pump, or £9,000 with the rural and island uplift. You must have a written offer before any work starts, and both the installer and the product must be MCS certified.
- Home Energy Scotland loan: an optional interest-free loan of up to £7,500 on top of the grant.
- Warm Homes Loan Scheme: low and zero-interest loans of up to £20,000 for an air-to-water heat pump, with some terms up to 30 years. It can be combined with the Home Energy Scotland grant, and we’re part of the scheme.
The Boiler Upgrade Scheme you may have read about is for England and Wales only, so it doesn’t apply here. Our Home Energy Scotland grant and loan guide walks you through the application, and there’s more on the Warm Homes Loan Scheme in Scotland here. For a wider look at pricing, see how much a heat pump costs.
What Property Types Suit a Panasonic Aquarea?
A Panasonic Aquarea L Series suits most homes up to a medium-sized detached house, including older properties with existing radiators. Larger or very draughty homes are better matched to the M Series T-CAP, which comes in 9kW and 12kW on a single-phase supply and 16kW on three-phase.
Here’s how I’d match them up:
- Flats and small homes: the 5kW L Series, or the 3.2kW K Series in a well-insulated new build. The All in One works nicely where there’s no loft for a cylinder.
- Semis and terraces: the 5kW or 7kW L Series is a common fit for the 1930s semis and ex-council homes we see in Dalkeith, Livingston and Kirkcaldy.
- Older stone-built homes: the 75°C flow temperature on the L Series gives more breathing room with existing radiators in Edinburgh villas or Borders farmhouses, although some radiators may still need upgrading. Our guide on whether you need to replace your radiators covers this.
- Large or rural homes: the M Series T-CAP 12kW, or the 16kW if you have a three-phase supply, which Panasonic says keeps its full output without a heater down to -20°C.
Pipework is worth checking early. Panasonic’s own schematics call for at least 22mm primary pipework on the 5kW and 7kW L Series and 28mm on the 9kW, to keep enough water moving. Many older systems have smaller pipes in places, so we’ll look at this during the survey.
Outdoor space matters too. The L Series outdoor unit measures 996 x 980 x 430mm and weighs about 98kg. As it uses R290, it also needs to be positioned with enough clearance from openings like windows and doors. Our guide to heat pump noise is handy if you’re worried about neighbours, although at 52 to 54 dB(A) sound power the L Series is on the quieter side.
Panasonic Aquarea Maintenance Requirements
A Panasonic Aquarea heat pump needs a service once a year by a suitably trained engineer. Panasonic’s warranty terms make annual maintenance a condition of cover, and you’ll need to keep the records.
A typical yearly service includes:
- Cleaning the magnetic particle filter and strainer (the L Series has a magnetic filter inside the indoor unit)
- Checking system pressure and the expansion vessel
- Clearing leaves and debris from around the outdoor unit and checking the coil
- Checking the controls, sensors and software settings
Between services, keep the outdoor unit clear of snow and garden growth. Panasonic also offers Aquarea Service+ plans. If you’d like us to look after your system, see our heat pump aftercare options.
What Are the Ratings for Panasonic Heat Pumps?
There’s no independent, heat pump specific rating for Panasonic Aquarea that I’d lean on. Panasonic UK’s Trustpilot profile covers all of its products rather than heat pumps, and Which? hasn’t published Panasonic heat pump data.
Trustpilot
The “Panasonic UK” profile on Trustpilot is unclaimed, and its reviews are mostly about TVs, microwaves and other electronics, with no heat pump reviews that I could see. That makes it a poor guide to how an Aquarea performs in a home.
Which?
In its heat pump buying guide, Which? asked brands for product data and noted that Panasonic did not respond, so there’s no Which? data or score for Panasonic heat pumps to quote. I’d put more weight on your installer’s own reviews.
How Does Panasonic Aquarea Compare?
Panasonic Aquarea holds its own against the big names. It’s broadly similar to Mitsubishi and Samsung on refrigerant and flow temperature, with the compact All in One being its stand-out feature.
- Panasonic vs Mitsubishi Ecodan: The Ecodan R290 also reaches 75°C and comes in sizes from 5kW to 12kW, and it’s made in Livingston, West Lothian. Panasonic’s L Series tops out at 9kW but offers the All in One option. Read our Mitsubishi Ecodan review for the full picture.
- Panasonic vs Samsung: Samsung’s EHS Mono R290 runs at up to 75°C with sizes from 5kW to 16kW. Panasonic’s equivalent larger units sit in the M Series T-CAP. Our Samsung heat pump review covers it in detail.
Is a Panasonic Aquarea Right for You?
A Panasonic Aquarea is right for you if you want an efficient R290 heat pump that can run hot enough for older radiators, ideally with a compact indoor setup. It’s less suited to very large homes on the L Series, or to anyone who wants a long warranty without servicing conditions.
Choose Panasonic Aquarea If…
- You want a natural refrigerant with a GWP of just 3
- You’d like the refrigerant kept outside, with only water pipes coming indoors
- Your home has older radiators and you’d value up to 75°C flow temperature
- You want an All in One unit with a built-in 185 litre tank to save space
Don’t Choose Panasonic Aquarea If…
- Your home needs more than 9kW and you’d prefer to stay in the L Series (the M Series covers this instead)
- You don’t want to commit to annual servicing to keep the extended warranty
- You have no suitable outdoor spot that meets R290 positioning rules
- You actually want air-to-air heating, which isn’t eligible for the Home Energy Scotland grant (we now fit air-to-air systems too, so just ask)
Get a Free Heat Pump Quote From The Edinburgh Boiler Company
If a Panasonic Aquarea sounds like a good fit, we’d be happy to help. As one of Scotland’s leading MCS-certified heat pump installers, we’ll survey your home, size the system properly and give you a fixed price. We’ll also help you apply for the Home Energy Scotland grant and loan, and as part of the Warm Homes Loan Scheme we can talk you through low-interest finance too.
We cover Edinburgh, the Lothians, Fife, Falkirk, Stirling, Perth, Glasgow and the Borders. Book your free heat pump survey or find out more about our heat pump installation service.
Panasonic Aquarea Heat Pump FAQs
Is Panasonic a good heat pump brand?
Yes. Panasonic is a well-established heat pump maker, and its Aquarea L Series combines R290 refrigerant, up to 75°C flow temperatures and SCOP figures of up to 5.06. As with any brand, the quality of the design and installation matters just as much as the unit.
What is the difference between the Aquarea L Series and K Series?
The L Series uses R290 refrigerant and reaches up to 75°C, with the refrigerant kept in the outdoor unit. The K Series uses R32, reaches up to 60°C and has refrigerant pipework running between the outdoor and indoor units.
Does Panasonic make a monobloc heat pump?
In effect, yes. The L Series and M Series keep all the refrigerant sealed in the outdoor unit like a monobloc, though Panasonic sells them as hydraulic split or bi-bloc systems because they come with an indoor unit for the water side and controls.
What sizes does the Panasonic Aquarea L Series come in?
The L Series comes in 5kW, 7kW and 9kW sizes, all single phase. For larger homes, Panasonic’s M Series T-CAP comes in 9kW and 12kW (single or three phase) and 16kW (three phase).
Can a Panasonic heat pump work with my existing radiators?
Often, yes. The L Series can heat water to 75°C, which helps with existing radiators, but we always check each room’s heat loss and radiator size during the survey. Some homes still need a few radiators upgraded to run efficiently.
How long is the Panasonic Aquarea warranty?
Up to 7 years when the system is fitted and registered by a Panasonic PRO Partner and serviced every year. Shorter standard terms apply otherwise, so always ask your installer which level you’ll get.
Does a Panasonic Aquarea work in a Scottish winter?
Yes. The L Series heats down to -25°C outdoors and can still deliver 75°C water at -10°C. Proper sizing for your home is what keeps it comfortable on the coldest days.
Is a Panasonic Aquarea eligible for the Home Energy Scotland grant?
Yes, as long as the model is MCS certified, it’s fitted by an MCS-certified installer and it provides all your heating and hot water. You must get a written grant offer before any work starts. Use our grant checker to see what you could get.
