We explain in detail the features and how to use eco-cute and electric water heaters in rental properties, compare utility costs with gas water heaters, and outline important precautions for daily living.
Reviewed by: Nobuyuki MoriPresident, M-Assets Co., Ltd. / Licensed Real Estate Transaction Specialist (Miyagi #018212)
Rental properties come equipped with various water heating systems. In addition to gas water heaters, some properties feature "eco-cute" or electric water heaters. These are especially common in all-electric units, new apartment buildings, and properties designed with energy efficiency in mind.
Rental kitchens come in gas stovetop and induction cooker versions. We provide a thorough comparison from multiple perspectives—whether you can bring your own equipment, utility cost differences, fire risk, and cooking convenience—to help you find the best choice for your lifestyle.
A detailed guide to the benefits and selection of rental properties with re-heating functions, their impact on electricity and gas bills, and who pays for repairs.
An all-electric rental uses only electricity for all needs—no gas at all. Because there's no open flame, safety is high, and utility costs can be managed in one billing statement. However, electricity rates can be higher, and there are risks during power outages. Here's a complete guide to the merits and demerits you should know before signing a lease.
For those who want to play their instruments freely, "instrument-friendly properties" and "soundproof rooms" are special options. This expert guide covers where to find them, what to confirm before signing, how to assess soundproofing performance, and DIY soundproofing solutions you can implement after moving in.
Electric Water Heater An electric water heater uses an electric heating element to warm water, which is then stored in a tank. The system typically heats water during off-peak hours (late night, when electricity is cheaper) and stores it for use throughout the day. The structure is simple and breakdowns are rare, though heating efficiency is lower compared to eco-cute systems.
Eco-Cute (Heat Pump Water Heater) Eco-cute systems are energy-efficient equipment that use heat from the air to warm water. They can produce 3 to 5 times more heat energy than the electrical energy consumed, making them significantly more efficient than electric water heaters. The system consists of an outdoor unit (similar in appearance to an air conditioning compressor) paired with an insulated storage tank.
The main advantage of eco-cute and electric water heater systems is the savings potential from using off-peak electricity rates.
Estimated Monthly Costs (Single-person Household, Average Monthly Hot Water Usage)
However, costs vary significantly depending on your electricity plan. If your plan is not an all-electric rate plan (which offers cheaper night-time rates), you may not see much savings. When you move in, confirm your electricity company's plan options with them.
Living with an eco-cute or electric water heater requires understanding how these systems differ from gas water heaters.
There's a Limited Supply of Hot Water The storage tank holds a finite amount of hot water. Tank capacity typically ranges from 370L to 460L, which is usually sufficient for a single person but can run out if multiple people bathe and do dishes in succession.
When You Run Out of Hot Water The system automatically reheats water during late-night hours, but if you run out during the day, you'll need to manually activate the "daytime heating" function (which uses more expensive daytime electricity). Operation methods vary by model, so ask your landlord or management company to show you how to use it when you move in.
Tank Water May Not Be Suitable for Drinking Although the water in an eco-cute tank is maintained at high temperatures, it circulates over long periods and is not recommended for drinking or cooking. Always use tap water (or filtered tap water) for drinking and food preparation.
Be Aware of Heating Time Periods The outdoor unit runs during late-night hours (roughly 11 p.m. to 7 a.m.) to heat water. If you need a quiet environment at night, check the location of the outdoor unit beforehand. In apartment buildings, units are typically installed in common areas or positioned to minimize noise for adjacent units.
For eco-cute and electric water heater repairs, the management company (landlord) generally covers costs.
Typically Covered by the Management Company
Cases Where Residents May Be Responsible
Eco-cute systems typically have a lifespan of 10 to 15 years. If you discover a malfunction, contact your management company rather than attempting repairs yourself.
Because eco-cute and electric water heater systems have outdoor storage tanks and piping, there is a risk of pipe freezing in cold climates or during severe cold snaps.
If you'll be away for several days or longer, some models offer a "standby mode" or "heating pause" setting that can reduce unnecessary electricity use. However, completely shutting off power also disables freeze-prevention functions, so it's best to leave the power on during winter.
The hot water suddenly became lukewarm: You've likely run out of hot water. Check the remaining water level on the remote control display and run a heating cycle if needed. On days when you're expecting guests or planning multiple baths, it's a good idea to set the tank to "extra" the day before.
The water has an odd smell or appears cloudy: This could indicate buildup inside the tank or a piping issue. Don't attempt to disassemble or drain the tank yourself—contact your management company. Ideally, tanks should be serviced periodically, but in rental properties you should follow your management company's instructions.
My electricity bill is higher than expected: A common cause is that the off-peak rate plan isn't activated and the system is heating water during expensive daytime hours. Check your electricity meter reading statement or your power company's online account to confirm your plan name and time-of-use rates.
Before moving into a property with an eco-cute or electric water heater, make sure to check the following:
Eco-cute and electric water heater systems have a low environmental impact and can help keep electricity costs down. With a proper understanding of how they work and their characteristics, you can enjoy a comfortable and energy-efficient life in your rental home. If you're considering an all-electric property, take time to understand the type of water heating equipment and how to operate it before making your choice.
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