Customized heat pump
Tell us the job. We will build the machine.
The thirteen published ranges cover most jobs. This page is for the ones they do not — a temperature, a duty, a water quality or an environment that wants a machine designed around it. Work out the duty, choose the build, and our engineers come back with the machine, the price and a delivery time.
Duty
No ceiling
the published range stops at 200 kW; this does not
Delivery
Up to 120°C
pressurised hot water, single cycle or cascade
Ambient
Down to −35°C
enhanced vapour injection or cascade
Compressors
Up to 8
in one frame, or several frames run as one
The duty
The part we can actually work out for you.
Three ways in, because engineers arrive with
different numbers. All three end at the same kilowatts.
Flow to heat
5000litres/hour
Water coming back
30°C
Water you need out
90°C
This is the single figure that decides the refrigerant, and with it most of the machine.
What is being heated
Sizing margin
15%
Machines wanted
1
The source, and the water
Where the heat comes from, and what it has to survive.
Where the heat comes from. This decides as much
about the machine as the delivery temperature does.
Design air temperature
25°C
The air the machine has to work in at its worst. Below −20 °C tick extreme low ambient further down.
Water quality
This chooses the condenser as surely as the duty
chooses the compressor.
The build
Cabinet, controls and how the compressors are arranged.
Cabinet
Controller
Compressor make
Scroll across the whole range. Tell us if a site
standard or a service contract ties you to one make.
How many, and how they run
The circuit
Refrigerant, condenser, and anything else it has to do.
Refrigerant
Delivery temperature sets what is possible; your
reporting position often sets what is preferred.
Condenser
Anything else it has to do
Tick as many as apply — these are not exclusive.
What you pay for energy
For the comparison panel. Change these to your own tariff.
What makes this heat today
Electricity
9₹/kWh
Hours a day it runs
12hours
Days a year
300days
COP to compare at
3.0
You set this, not us. A machine that has not been designed has no rating, so the cost panel needs a figure to work from. Put in what you would accept, and treat the result as a comparison rather than a promise.
Notes for our engineers
The things a form never asks about.
This goes onto the sheet and into the enquiry
verbatim.
Fuel and efficiency assumptions change only if you know why
Diesel
92₹/litre
LPG (commercial)
95₹/kg
PNG
55₹/SCM
Coal / biomass
9.5₹/kg
Diesel boiler efficiency
80%
Diesel energy content
10kWh/litre
LPG boiler efficiency
88%
LPG energy content
12.8kWh/kg
PNG boiler efficiency
88%
PNG energy content
10.5kWh/SCM
Coal boiler efficiency
65%
Coal energy content
4.5kWh/kg
Electric heating efficiency
98%
Duty the machine has to cover
—
This is an enquiry, not a quotation
The kilowatts above are worked out from your own figures and hold for any machine. Everything below is what you are asking for — there is no data sheet behind a machine that has not been built, so this page quotes no capacity, no COP and no price for it. Send it and our engineering team comes back with all three.
What follows from the duty
Your configuration
What our engineers will look at
Cost to run for one day
You would save
—
Send this to our engineering team
Your name, phone and email go on the sheet and let our team come back with the machine, the price and a delivery time. All three are needed before the enquiry can be sent or saved.
How this page works, and where it stops
- The duty is computed. The machine is not. Kilowatts from flow × density × specific heat × temperature rise, or from a batch over the time you allow. That arithmetic is true of any heat pump ever built, so it does not need a data sheet. The configuration below it is recorded, and deliberately carries no capacity or COP — those come out of the engineering review, not out of a web form.
- Why there is no price. A custom machine is priced from its bill of materials, and that does not exist until it has been designed. Any number this page produced would be wrong, and you would quite reasonably hold us to it.
- The COP in the cost panel is yours, not ours. The comparison needs some figure to work from, so the slider is there and labelled. It is a way of asking “what would this be worth if it ran at 3.0?”, not a rating.
- Refrigerant against delivery temperature is checked against the published compressor envelopes we actually build on — the same windows behind the High, Super High and Ultra High Temperature pages. R410A to about 60 °C, R134a and R1234ze to 80, R515B to 95, R245fa and the cascade to 120.
- R245fa needs a warm source, and that is physics. Its compressor window starts at 22 °C evaporating. Fed with ambient air it is outside its permitted envelope entirely — not derated, outside it. Where you want 120 °C from air, the cascade is the answer.
- Water quality picks the condenser. Chloride wants titanium; nothing else survives a pool or brackish water. Acidic or deionised water attacks the copper braze in a standard plate exchanger, so it wants the stainless-brazed one. Water carrying solids wants a tube in shell, because that is the one you can actually rod.
- Buffer volume of 12 to 25 litres per kilowatt keeps the compressor off a short cycle and gives a defrost somewhere to draw from. Pipe size is set at a 1.5 m/s velocity ceiling. Both are rules of thumb, and both are on the sheet so you can see what was assumed.
- Everything you enter is recorded on the saved sheet, including the assumptions. Confirm the final design with Sunniva Encon LLP before ordering.
Custom heat pump — engineering enquiry
Sunniva Encon LLP
Calculated for
—
What you entered
Result
Required capacity
—
—
Running cost & savings
How this was worked out
Talk to Sunniva
SalesWhatsApp our sales desk
LinkedInFollow Sunniva Encon
YouTubeSee the machines running
Review usRate us on GoogleContact
+91 93213 65103sales@sunnivaencon.com
www.sunnivaencon.com
Office
C‑443, Oshiwara Industrial Centre Premises CHS, New Link Road, Goregaon West, Mumbai© 2026 Sunniva Encon LLP. The design and code of this calculator are our copyright. Results are indicative and offered in good faith — the method is set out above. Confirm the final selection with us before ordering.
1
Customized heat pump
Tell us the job. We will build the machine.
The thirteen published ranges cover most jobs. This page is for the ones they do not — a temperature, a duty, a water quality or an environment that wants a machine designed around it. Work out the duty, choose the build, and our engineers come back with the machine, the price and a delivery time.
Duty
No ceiling
the published range stops at 200 kW; this does not
Delivery
Up to 120°C
pressurised hot water, single cycle or cascade
Ambient
Down to −35°C
enhanced vapour injection or cascade
Compressors
Up to 8
in one frame, or several frames run as one
The duty
The part we can actually work out for you.
Three ways in, because engineers arrive with
different numbers. All three end at the same kilowatts.
Flow to heat
5000litres/hour
Water coming back
30°C
Water you need out
90°C
This is the single figure that decides the refrigerant, and with it most of the machine.
What is being heated
Sizing margin
15%
Machines wanted
1
The source, and the water
Where the heat comes from, and what it has to survive.
Where the heat comes from. This decides as much
about the machine as the delivery temperature does.
Design air temperature
25°C
The air the machine has to work in at its worst. Below −20 °C tick extreme low ambient further down.
Water quality
This chooses the condenser as surely as the duty
chooses the compressor.
The build
Cabinet, controls and how the compressors are arranged.
Cabinet
Controller
Compressor make
Scroll across the whole range. Tell us if a site
standard or a service contract ties you to one make.
How many, and how they run
The circuit
Refrigerant, condenser, and anything else it has to do.
Refrigerant
Delivery temperature sets what is possible; your
reporting position often sets what is preferred.
Condenser
Anything else it has to do
Tick as many as apply — these are not exclusive.
What you pay for energy
For the comparison panel. Change these to your own tariff.
What makes this heat today
Electricity
9₹/kWh
Hours a day it runs
12hours
Days a year
300days
COP to compare at
3.0
You set this, not us. A machine that has not been designed has no rating, so the cost panel needs a figure to work from. Put in what you would accept, and treat the result as a comparison rather than a promise.
Notes for our engineers
The things a form never asks about.
This goes onto the sheet and into the enquiry
verbatim.
Fuel and efficiency assumptions change only if you know why
Diesel
92₹/litre
LPG (commercial)
95₹/kg
PNG
55₹/SCM
Coal / biomass
9.5₹/kg
Diesel boiler efficiency
80%
Diesel energy content
10kWh/litre
LPG boiler efficiency
88%
LPG energy content
12.8kWh/kg
PNG boiler efficiency
88%
PNG energy content
10.5kWh/SCM
Coal boiler efficiency
65%
Coal energy content
4.5kWh/kg
Electric heating efficiency
98%
Duty the machine has to cover
—
This is an enquiry, not a quotation
The kilowatts above are worked out from your own figures and hold for any machine. Everything below is what you are asking for — there is no data sheet behind a machine that has not been built, so this page quotes no capacity, no COP and no price for it. Send it and our engineering team comes back with all three.
What follows from the duty
Your configuration
What our engineers will look at
Cost to run for one day
You would save
—
Send this to our engineering team
Your name, phone and email go on the sheet and let our team come back with the machine, the price and a delivery time. All three are needed before the enquiry can be sent or saved.
How this page works, and where it stops
- The duty is computed. The machine is not. Kilowatts from flow × density × specific heat × temperature rise, or from a batch over the time you allow. That arithmetic is true of any heat pump ever built, so it does not need a data sheet. The configuration below it is recorded, and deliberately carries no capacity or COP — those come out of the engineering review, not out of a web form.
- Why there is no price. A custom machine is priced from its bill of materials, and that does not exist until it has been designed. Any number this page produced would be wrong, and you would quite reasonably hold us to it.
- The COP in the cost panel is yours, not ours. The comparison needs some figure to work from, so the slider is there and labelled. It is a way of asking “what would this be worth if it ran at 3.0?”, not a rating.
- Refrigerant against delivery temperature is checked against the published compressor envelopes we actually build on — the same windows behind the High, Super High and Ultra High Temperature pages. R410A to about 60 °C, R134a and R1234ze to 80, R515B to 95, R245fa and the cascade to 120.
- R245fa needs a warm source, and that is physics. Its compressor window starts at 22 °C evaporating. Fed with ambient air it is outside its permitted envelope entirely — not derated, outside it. Where you want 120 °C from air, the cascade is the answer.
- Water quality picks the condenser. Chloride wants titanium; nothing else survives a pool or brackish water. Acidic or deionised water attacks the copper braze in a standard plate exchanger, so it wants the stainless-brazed one. Water carrying solids wants a tube in shell, because that is the one you can actually rod.
- Buffer volume of 12 to 25 litres per kilowatt keeps the compressor off a short cycle and gives a defrost somewhere to draw from. Pipe size is set at a 1.5 m/s velocity ceiling. Both are rules of thumb, and both are on the sheet so you can see what was assumed.
- Everything you enter is recorded on the saved sheet, including the assumptions. Confirm the final design with Sunniva Encon LLP before ordering.
Custom heat pump — engineering enquiry
Sunniva Encon LLP
Calculated for
—
What you entered
Result
Required capacity
—
—
Running cost & savings
How this was worked out
Talk to Sunniva
SalesWhatsApp our sales deskLinkedInFollow Sunniva EnconYouTubeSee the machines runningReview usRate us on GoogleContact
+91 93213 65103sales@sunnivaencon.com
www.sunnivaencon.com
Office
C‑443, Oshiwara Industrial Centre Premises CHS, New Link Road, Goregaon West, Mumbai© 2026 Sunniva Encon LLP. The design and code of this calculator are our copyright. Results are indicative and offered in good faith — the method is set out above. Confirm the final selection with us before ordering.
1