Central heat pump water heaters are not a new product, but are still quite unfamiliar to many users. This is an effective and convenient hot water solution for projects with great demand. Below is the basic information you need to know about this product line.
1. What is a central heat pump water heater?
Water heater center good heat pump whose English name is Heat Pump Hot Water System is a water heating system using heat pump technology. This technology is based on the principle of thermodynamics to transport heat from one environment to another, so that water will take temperature from the surrounding environment to heat up instead of using heating rods like traditional water heaters.
This type of machine usually has a large hot water capacity – usually over 160 liters and some up to thousands of liters. Along with the ability to heat water quickly and save costs, central water heaters are often used to supply hot water to hotels, buildings, apartments, factories, or for families with swimming pools to supply hot water to the swimming pool in the winter.
Central heat pump water heater is a superior water heating solution (Photo: cheapahotwater)
In the current Vietnamese market, central water heaters are mainly distributed in two types:
Central water heater in 2 separate units: This type is the traditional type, separating the insulation tank and the heat exchange compressor part.
2-piece central water heater (Photo: Daikin).
Combo central water heater (all in one): This type integrates the heat exchanger, compressor and insulation tank on a unified block
All in one central water heater (Photo: Midea).
Normally, a 2-piece central water heater will be cheaper, but the all-in-one type has the advantage of a more compact design.
In addition to the two popular types above, there are also lines swimming pool heat pump Specially designed specifically for swimming pools. With this type, the swimming pool acts as an insulation/heat exchanger and the machine only has a single block with the appearance of an outdoor unit. air conditioner temperature.
3. Structure and operating principle of central heat pump water heater
Here it is Typical structure of a central water heater:
Structure of a 2-piece central water heater (Photo: Websosanh.vn).Structure of an all in one heat pump (Photo: Websosanh.vn).
Basically, the structure of the above two central water heater lines are similar, but the only difference is the smart arrangement of all parts on the same block in the all-in-one heat pump line. The parts that are the “heart” of this system include: compressor, evaporator (part in contact with air), condenser (part in contact with water) and refrigerant.
Operating principle of central water heater as follows:
The refrigerant (usually using gas R290, R134a, R744) will take heat from the air at the evaporator, thereby warming it up.
The refrigerant is led through the compressor, thanks to the high pressure, the temperature of the refrigerant is heated up (up to 100 degrees Celsius).
The refrigerant is led through the heat exchanger in the insulation tank, where the water in the insulation tank will take heat from the refrigerant, and heat up.
The refrigerant, after losing heat from water, will be guided through the expansion valve, returned to the evaporator and continue a new cycle.
This heat exchange cycle will continue until the water in the insulated tank is completely heated. The hot water in the insulated tank will also be kept hot for a long time thanks to the insulated shell structure, so users will constantly have hot water without the machine needing to operate continuously.
4. Advantages and disadvantages of heat pump central water heaters
Thanks to its special structure and operating principle, compared to other lines hot and cold shower tank Traditionally, central water heaters have many outstanding advantages.
– Advantages of central water heaters
Heats water very quickly and can heat extremely large water capacities that traditional water heaters cannot do.
A variety of water temperature levels can be customized to meet usage purposes
Flexible integration into the building’s water use system
Outstanding electricity savings, according to experts, central water heaters only use 1/3 or even 1/4 of the electricity of traditional water heaters.
Outstanding safety and environmental friendliness
Extremely durable
– Disadvantages of central water heaters
Water heater price The cheapest center is from 40 million VND, with many machines costing up to hundreds of million VND depending on capacity and brand.
Even though it has a high price, with many outstanding advantages, especially electricity saving efficiency, safety and durability for long-term use, a central water heater is definitely still an extremely reasonable investment. The product is especially suitable for villas/penthouses with swimming pools, buildings, hotels, or projects that require large amounts of hot water. In addition, for normal families, a central water heater with a capacity of about 160 liters is also a worthy option to consider replacing traditional hot and cold shower tanks or hot water heaters. solar water heater (which has a weak point of poor heating on rainy, cloudy days).
5. TOP 5 best central heat pump water heaters to buy today
Currently, there are many brands involved in the production of central water heaters, of which the brands with the highest quality ratings include: Daikin, Stiebel, Mitsubishi, Hitachi, Bosch, SamsungLG, Midea, Gree…
Below is the name book 5 best central heat pump water heaters in 2025 according to votes from the hotwatershop website:
5.1. Rinnai Hydraheat Heat Pump
COP: Up to 4.7
Noise level: 45 dB(A)
Tank capacity: 275L (692×1750 mm) and 340L (692×1995 mm)
Outstanding features: Smart control, anti-icing, specifically designed for New Zealand climate and coastal areas
Refrigerant: R290
Best suited for: Medium to large households, very smart modular design
5.2. Stiebel Eltron WWK 302H
COP: 3.38
Noise level: 45 dB(A)
Tank capacity: 222L (690×1560 mm) and 302L (690×1930 mm)
Outstanding features: German technology, electronic anode bar, 1.5 kW backup resistor (on H version), compatible with solar power (Solar PV)
Refrigerant: R134a
Warranty: 5 years on tank and condenser / 2 years on other parts
Best for: People who want a low-maintenance machine with a smart electronic anode and a faithfully declared COP (based on air temperature of 18°C and water inlet of 8°C)
https://orcid.org/0009-0009-1599-2739
