EVI heat pumps — 60 °C water at −25 °C outside
EVI air-source heat pumps transfer heat from ambient air to water, providing hot water up to 60 °C. The direct-heating design operates well down to −25 °C without an auxiliary heater.
Is this the right range for you?
Two minutes here saves a wasted quotation. The boundaries below are the published ones, not sales judgement.
Yes, if all of these are true
- Your design winter is below about 5 °C
- You need 55–60 °C hot water, space heating, or both
- You are in the hills, or anywhere with a real winter
- You do not want an electric backup heater in the bill
Look at another range if
- Your winter stays above 5 °C — see Commercial Heat Pump
- You need water hotter than 60 °C — see High Temperature Heat Pump
- It is a swimming pool in a mild climate — see Swimming Pool Heat Pump
Applications
Where this range is normally installed.
Key features
What is inside the cabinet, and why each of them is there.
Enhanced vapour injection
A second injection port into the compressor keeps the discharge temperature down and the capacity up when the air is very cold. It is what makes −25 °C possible without an electric heater doing the work.
Low running costs, COP up to 5
Compatible with traditional radiator systems
Reduces capital cost on a retrofit — the emitters can often stay.
Long-life corrosion-resistant composite cabinet
Built for severe climates, where salt, snow and freeze-thaw are what actually destroy an outdoor unit.
American Copeland / Panasonic scroll compressor
Self-diagnostic digital control panel
Models in this range
Every figure below is taken from that model’s own technical data sheet, at its rated test condition. Full performance at every certified ambient is in the PDF.
| Model | Heating capacity | COP | Hot water output | Dimensions (L×W×H) | |
|---|---|---|---|---|---|
| SE-EVI-21U | 20.9 kW | 3.8 | 515 LPH | 800 × 800 × 1110 mm | Datasheet ↓ |
| SE-EVI-42U | 41.8 kW | 3.8 | 1030 LPH | 1450 × 890 × 1110 mm | Datasheet ↓ |
Benefits
What this range does for the building, rather than what is in the box.
It works when nothing else does
Sub-zero operation without an auxiliary heater. A standard air-source machine loses output fast below about 5 °C; this one is published to −25 °C.
No backup heater to run
The commonest hidden cost in cold-climate heat pumps is the electric element that quietly does half the work. There isn't one here.
Hot water and space heating from one machine
A hotel in the hills buys one plant for both.
Why the crossover is at about 5 °C
It is not a marketing line, it is where the published data stops. The SE-AH range publishes capacity at 20, 15, 10 and 5 °C ambient and no lower. The SE-EVI range publishes at 20, 10, 0, −10 and −20 °C. Our calculators refuse to extrapolate a machine past its own tested envelope, which is why the recommendation changes on its own as you drag the temperature down.
Set your winter temperature and watch it switch
Our commercial hot water calculator picks between the standard and EVI ranges on its own. Drag the design temperature below 5 °C and the recommendation moves to EVI, because that is where the published data goes. For space heating, use the space heating calculator.
And what every Sunniva heat pump gives you
True of the whole range, not just this one.
- Up to 75 % off water heating against electric, LPG or PNG
- Quick payback and strong return on investment
- The longest product life of any common water-heating technology
- Silent operation
- Hot water round the year, independent of sunlight
- Lower carbon emissions
- Negligible maintenance cost
- Saves space against a boiler or a solar-thermal field
Common questions
The ones our engineers are actually asked.
Does it need an electric backup heater?
What happens to capacity as it gets colder?
Can it do space heating as well as hot water?
Downloads and related ranges
Performance figures are published test data at the stated conditions and are not a guarantee for a specific installation. Draw-off pattern, pipe runs, water quality, static head and local code all affect the final selection — confirm with Sunniva Encon LLP before ordering.
1
EVI heat pumps — 60 °C water at −25 °C outside
EVI air-source heat pumps transfer heat from ambient air to water, providing hot water up to 60 °C. The direct-heating design operates well down to −25 °C without an auxiliary heater.
Is this the right range for you?
Two minutes here saves a wasted quotation. The boundaries below are the published ones, not sales judgement.
Yes, if all of these are true
- Your design winter is below about 5 °C
- You need 55–60 °C hot water, space heating, or both
- You are in the hills, or anywhere with a real winter
- You do not want an electric backup heater in the bill
Look at another range if
- Your winter stays above 5 °C — see Commercial Heat Pump
- You need water hotter than 60 °C — see High Temperature Heat Pump
- It is a swimming pool in a mild climate — see Swimming Pool Heat Pump
Applications
Where this range is normally installed.
Key features
What is inside the cabinet, and why each of them is there.
Enhanced vapour injection
A second injection port into the compressor keeps the discharge temperature down and the capacity up when the air is very cold. It is what makes −25 °C possible without an electric heater doing the work.
Low running costs, COP up to 5
Compatible with traditional radiator systems
Reduces capital cost on a retrofit — the emitters can often stay.
Long-life corrosion-resistant composite cabinet
Built for severe climates, where salt, snow and freeze-thaw are what actually destroy an outdoor unit.
American Copeland / Panasonic scroll compressor
Self-diagnostic digital control panel
Models in this range
Every figure below is taken from that model’s own technical data sheet, at its rated test condition. Full performance at every certified ambient is in the PDF.
| Model | Heating capacity | COP | Hot water output | Dimensions (L×W×H) | |
|---|---|---|---|---|---|
| SE-EVI-21U | 20.9 kW | 3.8 | 515 LPH | 800 × 800 × 1110 mm | Datasheet ↓ |
| SE-EVI-42U | 41.8 kW | 3.8 | 1030 LPH | 1450 × 890 × 1110 mm | Datasheet ↓ |
Benefits
What this range does for the building, rather than what is in the box.
It works when nothing else does
Sub-zero operation without an auxiliary heater. A standard air-source machine loses output fast below about 5 °C; this one is published to −25 °C.
No backup heater to run
The commonest hidden cost in cold-climate heat pumps is the electric element that quietly does half the work. There isn't one here.
Hot water and space heating from one machine
A hotel in the hills buys one plant for both.
Why the crossover is at about 5 °C
It is not a marketing line, it is where the published data stops. The SE-AH range publishes capacity at 20, 15, 10 and 5 °C ambient and no lower. The SE-EVI range publishes at 20, 10, 0, −10 and −20 °C. Our calculators refuse to extrapolate a machine past its own tested envelope, which is why the recommendation changes on its own as you drag the temperature down.
Set your winter temperature and watch it switch
Our commercial hot water calculator picks between the standard and EVI ranges on its own. Drag the design temperature below 5 °C and the recommendation moves to EVI, because that is where the published data goes. For space heating, use the space heating calculator.
And what every Sunniva heat pump gives you
True of the whole range, not just this one.
- Up to 75 % off water heating against electric, LPG or PNG
- Quick payback and strong return on investment
- The longest product life of any common water-heating technology
- Silent operation
- Hot water round the year, independent of sunlight
- Lower carbon emissions
- Negligible maintenance cost
- Saves space against a boiler or a solar-thermal field
Common questions
The ones our engineers are actually asked.
Does it need an electric backup heater?
What happens to capacity as it gets colder?
Can it do space heating as well as hot water?
Downloads and related ranges
Performance figures are published test data at the stated conditions and are not a guarantee for a specific installation. Draw-off pattern, pipe runs, water quality, static head and local code all affect the final selection — confirm with Sunniva Encon LLP before ordering.
1