Shanghai Garden Hotel
Annual cost reduction through an integrated domestic hot water (DHW) system.
47.5%Cost reduction
CO₂ heat pump for hot water up to 90 °C
iTOMIC (Nihon Itomic Co., Ltd., Tokyo), founded in 1948, calls itself a pioneer of CO₂ heat pump water heaters; its units supply hot water at up to 90 °C.
- 3.8×Heat out for the power in, over a year
- 14–64%Lower energy cost (iTOMIC cases)
- 90 °CMaximum hot-water output
Exploded view
The heat pump, taken apart
CO₂ heat pump technology extracts heat from ambient air and uses it to generate hot water with exceptional efficiency.
- Fans V-shaped airflow.
- Air heat exchanger Thermal energy is extracted from ambient air using specialised heat exchangers.
- Compressor The natural CO₂ refrigerant is compressed, raising its temperature for water heating.
- Double-tube heat exchanger A double-tube heat exchanger efficiently transfers the heat to the water supply.
- Y-Frame casing (CHP-80Y2, 65 kW) About 30% less floor space for a three-unit layout, and 30% lighter than the previous model (iTOMIC).
- Water connections The iTOMIC CHP-80Y2 delivers hot water at 60 °C to 90 °C.
Operating principle
How a CO₂ heat pump works
CO₂ heat pump technology extracts heat from ambient air and uses it to generate hot water with exceptional efficiency.
-
Heat extraction
Heat exchangers draw thermal energy from the ambient air.
-
CO₂ compression
The natural CO₂ refrigerant is compressed, which raises its temperature.
-
Heat transfer
A double-tube heat exchanger passes the heat to the water.
-
Hot water
The iTOMIC CHP-80Y2 delivers hot water at 60–90 °C, with a COP of up to 4.36.
The iTOMIC CHP-80Y2 (65 kW) delivers hot water at 60–90 °C with an annual heating efficiency of 3.8 and a COP of up to 4.36.
Illustration: the CO₂ cycle, simplified.
From the i-Kcal Thermal Academy — here is the physics, if you want it.
Where a heat pump beats steam, and where steam still wins: Industrial heat pumps in our free academy.
Advantages
Benefits of the CO₂ heat pump
| Item | Benefit | Description |
|---|---|---|
| 01 | Energy efficient | The iTOMIC CHP-80Y2 (65 kW) delivers hot water at 60–90 °C with an annual heating efficiency of 3.8 and a COP of up to 4.36. |
| 02 | Environmental impact | Natural CO₂ refrigerant with zero ozone depletion and minimal greenhouse-gas emissions. |
| 03 | Year-round performance | The CHP-80Y2 runs to -20 °C in its frozen-climate version, the smaller CHP-15H down to -25 °C outside air, with built-in anti-freeze features. |
| 04 | Cost savings | iTOMIC’s published cases show energy-cost cuts of 14% to 64% against oil, gas or steam boilers: 47.5% at a hotel in Shanghai, 51% at a chicken plant in Taiwan. |
| 05 | Space efficient | Y-Frame casing (CHP-80Y2, 65 kW): about 30% less floor space for a three-unit layout, and 30% lighter than the previous model (iTOMIC). |
| 06 | Lightweight design | At 680 kg it installs on more kinds of floor and roof. |
Specifications
CHP-80Y2 specifications
| Item | Parameter | Value |
|---|---|---|
| 01 | Heating capacity | 65 kW |
| 02 | Output temperature | 60 °C to 90 °C |
| 03 | Operating range (ambient) | −5 °C to 43 °C (Cold version to −15 °C, Frozen version to −20 °C) |
| 04 | Weight | 680 kg (700 kg operating) |
Product range
Three sizes, one technology
- Product line
Small size
15 kW
Compact solution for restaurants and small facilities.
- Lightweight design
- Easy installation
- 200 V compatible
- Product line
Medium size
35 kW
Balanced performance for mid-size facilities.
- Strong heating in cold climates (iTOMIC)
- Product line
Large size
65 kW
Industrial-grade capacity for major facilities, in the Y-Frame casing.
- About 30% less floor space for a three-unit layout (iTOMIC)
- V-shaped airflow
- High efficiency from the Y-Frame (iTOMIC)
- Maximum capacity
Natural refrigerant
Natural refrigerant leadership
Since 2002, iTOMIC has been at the forefront of CO₂ heat pump technology, pioneering natural refrigerant solutions ahead of global environmental regulations.
- Zero ozone depletion potential (ODP)
- GWP of 1, against about 1,400–2,100 for the common HFC refrigerants
- Compliant with the Montreal Protocol and the Kigali Amendment
- Supporting the global phase-down of harmful HFCs
3,000+ iTOMIC CO₂ heat pump water heaters sold worldwide (iTOMIC’s figure).
Refrigerant evolution
- 1987CFC phase-outMontreal Protocol
- 2002iTOMIC launches Eco-CuteWhich iTOMIC calls the world’s first CO₂ heat-pump water heater for industrial use
- 2016Kigali AmendmentGlobal HFC phase-down
- TodayNatural refrigerant standardSustainable heating solutions
Case studies
Global success stories
-
-
Taiwan chicken processing
Fuel cost reduction in an industrial hybrid system.
51.1%Cost reduction -
Comfort Hotel Himeji
Energy cost reduction in guest-room hot water preheating.
14.4%Cost reduction (from iTOMIC’s gas-cost data)
About iTOMIC
Our philosophy
These mental backbones are fundamental to our everyday business execution. We are committed to offering people and the environment safe and comfortable hot water solutions tailored to individual needs.
We continuously develop unique and truly satisfactory products and services for our valued customers, contributing to a sustainable future.
Knowing people. Knowing things. Knowing time.
Founded 1948
Nihon Itomic Co., Ltd., Tokyo, calls itself a pioneer of CO₂ heat pump water heaters; its units supply hot water at up to 90 °C.
Global presence
3,000+ iTOMIC CO₂ heat pump water heaters sold worldwide (iTOMIC’s figure), serving commercial and industrial customers.
ISO 9001 certified
Committed to the highest standards of quality and manufacturing excellence.
FAQ
CO₂ heat pump questions
What water temperature can a CO₂ heat pump deliver?
The iTOMIC CHP-80Y2 delivers hot water at 60 °C to 90 °C.
How efficient is it?
The iTOMIC CHP-80Y2 (65 kW) delivers hot water at 60–90 °C with an annual heating efficiency of 3.8 and a COP of up to 4.36. The smaller CHP-15H reaches a COP of 4.59 and runs down to -25 °C outside air; the CHP-80Y2 runs to -20 °C in its frozen-climate version. iTOMIC’s published cases show energy-cost cuts of 14% to 64% against oil, gas or steam boilers: 47.5% at a hotel in Shanghai, 51% at a chicken plant in Taiwan.
Does it work in cold weather?
Yes. Depending on the model, it operates reliably in ambient temperatures down to −25 °C (and up to 43 °C), with built-in anti-freeze features.
Why CO₂ as the refrigerant?
CO₂ is a natural refrigerant with zero ozone depletion potential and a GWP of 1, against about 1,400–2,100 for the common HFC refrigerants (R134a, R407C, R410A). It is compliant with the Montreal Protocol and the Kigali Amendment.
Which sizes are available?
Three product lines: small (15 kW) for restaurants and small facilities, medium (35 kW), and large (65 kW, in the space-saving Y-Frame casing) for major industrial facilities.
Need process hot water up to 90 °C?
Tell us your hot-water demand and temperatures. We will size an iTOMIC CO₂ heat pump for your facility and estimate the energy-cost savings.