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Water Heater


Water heaters are broadly categorized into gas, electric and solar-powered heaters. Additionally, many manufacturers now offer water heaters that use an electric heat pump called EcoCute. An electric heat pump system uses heat extracted from the air to heat water. It helps to save money on electricity by using nighttime power. This in turn helps to balance the daytime and nighttime power demands for power plants. Hot water is circulated to bathrooms, floor heating systems and so on. The water is adjusted to a temperature specified via a remote controller (CLC communication) by mixing hot and cold water at a mixing valve. Microcontrollers are used for controlling a main unit and a remote controller. A common line communication (CLC) IC is also an essential component. Additionally, a pump motor uses an IPD (single-chip inverter). As is the case with air conditioners, an electric heat pump collects heat by compressing and expanding the refrigerant. A 32- or 8-bit microcontroller with analog functions may also be used. Power factor correction (PFC) ICs or IGBTs are used in the power supply circuit to keep harmonics in the input current below the IEC limit.

BLDC Motor CompressorBLDC Motor CompressorPhotocouplerPhotocouplerMicrocomputerMicrocomputerComm. ICRegulatorPhotocouplerMicrocomputerComm. ICRegulator Microcomputer Comm. IC Regulator

Recommended Products

Applications Semiconductor Recommended
General-Purpose Surge Absorption and
Circuit Protection
Zener Diodes CRYxx / CRZxx Series 0.7 W
CMZBxx Series 1.0 W
ESD Protection Diodes DF2SxxFS Series SOD-923/150 mW (1 in 1)
DF3AxxFU Series SOT-323/100 mW (2 in 1)
DF5Axx Series SOT-553/200 mW (4 in 1)
Switching Diodes 1SS352 SOD-323(USC)1in1
1SS181 / 1SS184 / 1SS226 SOT-346(S-Mini)2in1
1SS300 / 1SS301 / 1SS302 SOT-323(USM)2in1
Schottky Barrier Diodes CES520 / CES521 SOD-523(ESC)1in1
1SS392 / 1SS396 SOT-346(S-Mini)2in1
1SS393 SOT-323(USM)2in1
HN2S02FU SOT-363(US6)3in1
Applications Semiconductor Recommended Device Features
IGBT or PWMOSFET Drive Photocouplers TLP155E: 0.6A Output
TLP5701: 0.6A Output
TLP5751: 1A Output, Rail-to-rail Output
Direct IGBT or MOSFET drive; high speed
Pump Phototriac Couplers TLP560J / TLP561J
TLP267J / TLP268J
VDRM: 600 V, IT(RMS): 100 mA
VDRM: 600 V、IT(RMS): 70 mA
Applications Semiconductor Recommend Devices Features
Comm. IC Comm. ICs T6B70BFG/T6B70BFNG ASK communications
Applications Semiconductor Recommend Device Features
BLDC Motor IPD TPD4151K / TPD4142K
Fan Motor Motor controllers/Drivers TB6584FNG / AFNG Brushless DC motor controller; sine-wave current control
TB6586FG / AFG / BFG Brushless DC motor controller
Circulation Pump Motor controllers/Drivers TB6575FNG Brushless DC motor controller; sensorless
TB6588FG Brushless DC motor driver; sensorless
Micro-Bubble Control Motor controllers/Drivers TC78H600FTG / FNG
TB62216FG / FTG / FNG
2ch H-SW
TB67H301FTG / FNG 1ch H-SW
Stepping motor driver
Various IC power supplies LDO TCR2EFxx Series SOT-25(SMV)/200-mA output
TCR3DFxx Series SOT-25(SMV)/300-mA output

* System and product names mentioned herein may be trademarks or registered trademarks of respective companies or organizations.


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