Water Heater and EcoCute Replacement Costs
Kakeru Koumuten!
We handle not only single-family homes but also rental properties such as apartments and condominiums.
If you have concerns about your water heater, such as no hot water, unstable temperatures, or frequent errors, please feel free to consult with us.
From ¥70,000
3 years or more
Free of Charge
Water Heater Replacement Costs
This is a guide price for standard replacement, including the water heater, remote control, removal of the old unit, installation of the new unit, pipe connections, test operation, and disposal of waste materials.
Costs vary depending on the heater type (gas or electric), capacity (16, 20, or 24), features such as bathwater reheating, installation location, and installation method (wall-mounted, floor-standing, or in a pipe shaft).
Costs by Heater Type
This simple type only heats and supplies hot water. It does not reheat bathwater, which helps keep the unit price low. The bathtub is filled from the tap.
Example Models
Rinnai RUX Series / Noritz GQ Series
This type provides automatic bath filling, reheating, and temperature maintenance through a remote control. It reheats cooled bathwater to the set temperature, making it convenient when family members bathe at different times.
Example Models
Noritz GT-C Series (Auto)
In addition to the auto type features, this type automatically tops up the bathwater when the level drops and cleans the reheating pipes when the bath is drained. It is hygienic, convenient, and the most popular type.
Example Models
Rinnai RUF-A Series (Fully Automatic)
This energy-efficient gas water heater recovers heat from exhaust gases to heat water. It uses less gas than conventional models, helping reduce utility bills. It may qualify for national or local subsidies.
Example Models
Noritz GT-C62 Series / Rinnai RUF-E Series
This electric water heater uses heat from the air to heat water and stores it in a tank. It can use off-peak electricity and is well suited to all-electric homes and solar power systems.
Example Models
Mitsubishi Electric SRT Series / Panasonic HE Series
Costs by Capacity
A gas water heater’s capacity rating indicates how much hot water it can supply at once. For households that use hot water in multiple places simultaneously, a higher capacity is recommended. Even at the same capacity, costs vary depending on whether it is for hot water only, auto, or full auto.
Estimated for 1-2 person households
This capacity is suitable for single-person to two-person households where hot water is rarely used simultaneously.
Auto / Fully Automatic: From approx. ¥140,000
Estimated for 2-3 person households
This is a standard capacity that maintains water pressure even when using the shower and hot water simultaneously. It is the most commonly chosen for single-family homes.
Auto / Fully Automatic: From approx. ¥160,000
Estimated for 3-4 or more persons
This capacity can supply hot water simultaneously to multiple locations, such as the kitchen and bathroom. It is recommended for larger households.
Auto / Fully Automatic: From approx. ¥190,000
※ The price of the unit varies depending on capacity (sizes 16, 20 and 24) and features.
※ For the costs of Eco-Jozu (high-efficiency) and EcoCute (electric type), please refer to the “Estimated Costs by Type” above.
※ Additional costs may arise if changes to the installation location, extension or new installation of piping, or rewiring of remote controls are necessary.
※For installation in the pipe shaft of a condominium or for models with special exhaust directions, the base price may be higher. Additionally, the construction details may be specified by management regulations.
※Replacing with an EcoCute requires separate foundation work and electrical work (200V wiring).
※Costs can vary significantly depending on the product and the local conditions. The construction warranty varies based on the details and locations of the work.
If you send us a full photo of the existing water heater, a photo of the model number sticker on the front of the unit, photos of the installation area, and a photo of the bathroom remote control, we may be able to provide an estimate.
Request an estimate using photos and drawings
Water Heater Subsidies
Replacing to a high energy-efficient water heater may qualify for national subsidies. In particular, EcoCute models and Ene-Farm units have substantial subsidy amounts, reducing the burden of replacement costs. Here are some representative programs for the fiscal year 2026.
Subsidies are available for replacing with high-efficiency water heaters such as EcoCute models and Ene-Farm units. The subsidy amount is determined for each device, with the following estimates per unit:
- EcoCute (heat pump water heater): 70,000 yen～ (up to 100,000 yen/unit)
- Hybrid water heater: 100,000 yen～ (up to 120,000 yen/unit)
- Ene-Farm (home fuel cell): 170,000 yen/unit
- Additional amount for the removal of old electric water heaters and storage heating systems
※This project requires an internet connection and applications must be submitted through registered businesses. Eco-Jozu and general gas water heaters are not eligible for this project.
Eco-Jozu (condensing gas water heaters) and EcoFeel, which are not eligible for the Water Heater Energy Saving 2026 Project, may qualify for the Mirai Eco Housing 2026 Project. The estimate for Eco-Jozu is ¥30,000 per home. Applications should be combined with window insulation renovations (both projects cannot be applied for with the same water heater).
Depending on your municipality, there may be unique subsidy programs for the installation of high-efficiency water heaters. The eligible devices, amounts, and application periods vary by fiscal year. The systems in Yokohama City and Kawasaki City are also detailed on the subsidy page below.
※Subsidies and grants may change based on the fiscal year, budget, eligible products, and requirements, and may end within the application period once the budget is reached.
※Whether you are eligible, the possibility of application, and procedures will be confirmed during the on-site survey and estimate, and we will provide clear guidance.
Replacement Projects
After more than 15 years of installation and frequent errors, we replaced it with a full-auto type Eco-Jozu.
Due to unstable hot water temperature, we carried out replacement work with a successor model of the same installation type.
When to Replace a Water Heater
The timing for replacing a water heater depends on usage conditions and installation environment, but a general guideline is around 10 to 15 years.
The manufacturer’s standard design lifespan is about 10 years, and after that, parts supply ends, increasing the cases where repairs cannot be made even if it breaks down. If hot water suddenly becomes unavailable in winter, it greatly affects daily life, so we recommend early replacement as soon as symptoms begin to appear.
If you notice any of the following symptoms, please consider repair or replacement.
- Hot water temperature is unstable or lukewarm
- It takes time for hot water to come out
- Error codes frequently appear on the remote control
- Unusual noises or vibrations during operation
- Water leaks or rust from the main unit or pipes
- Recirculation or automatic water filling is not functioning
If the number of years since installation or replacement is short, you may be eligible for the manufacturer’s warranty or the construction company’s workmanship guarantee. Before requesting paid repairs or replacements, we recommend checking the warranty and construction contract, and consulting with the installing construction company or manufacturer.
If you notice blackening around the exhaust vent, unusual odors during operation, or signs of incomplete combustion, it is dangerous. Please stop using it and request an inspection immediately.
Need a Replacement Quote?
If you send us a photo of the water heater and the model number label, we may be able to provide a rough estimate
What is a Water Heater?
A water heater is a residential facility that supplies hot water to kitchens, washrooms, and bathrooms. There are various types, including “gas water heaters” that heat water with gas, “Eco-Jozu” that reuse exhaust heat, and “EcoCute” that heats water using electricity and a heat pump.
The capacity of a gas water heater is expressed as a capacity rating, indicating how many liters of water heated by 25°C above the incoming water temperature can be supplied per minute. Generally, size 16 is suitable for 1-2 people, size 20 for 2-3 people, and size 24 for households with 4 or more people.
Recently, many products come equipped with features that consider comfort and energy efficiency, such as:
- Full auto function that automatically fills, reheats, and maintains water temperature
- Pipe cleaning function that cleans the reheating pipes during drainage
- High-efficiency Eco-Jozu that reduce gas consumption
- Wireless LAN-compatible remote control that can be operated remotely via smartphone
- Bathroom monitor and voice notification function for monitoring bathing
- Energy-saving design that is easy to use even during power outages
Before Replacing Your Water Heater
If a household uses hot water in multiple places simultaneously and has insufficient capacity, the water pressure in the shower may weaken. We will propose options based on the current capacity, taking into account changes in family structure and usage. Please also confirm whether reheating is needed.
Select a model that matches the existing installation type, such as wall-mounted, freestanding, or inside a pipe shaft. In apartments, there may be restrictions on exhaust direction and size, limiting the available models. We will thoroughly check this during the on-site survey.
High-efficiency water heaters like Eco-Jozu and EcoCute may be eligible for subsidies from the national or local government. Performing the work simultaneously with a bathroom (unit bath) replacement can consolidate plumbing work, making it easier to reduce costs.
Combine Water Heater and Bathroom Replacement
During the bathroom (unit bath) replacement work, the reheating and water supply pipes will be newly connected. By replacing the water heater at the same time, you can consolidate plumbing work and the arrangement of craftsmen, reducing costs and construction time compared to doing them separately. If your water heater is over 10 years old, please consider simultaneous replacement.
Which Heater Suits Your Home?
We will check the installation type, capacity, piping, and eligibility for subsidies during the on-site survey.
Replacement Steps
Before the work, the water heater shows noticeable rust on the main body and dirt on the pipe cover due to aging.
Close the gas shut-off valve and water supply valve, turn off the power, then remove the gas pipe, water supply pipe, hot water pipe, and recirculation pipe to take out the existing water heater. We work carefully to avoid damaging the surrounding exterior walls.
Securely fix the new water heater to the wall or mounting base, and connect the gas pipe, water supply pipe, hot water pipe, and recirculation pipe. We also replace the insulation material and pipe cover to prevent freezing and deterioration.
We will replace the remote controls in the bathroom and kitchen with ones compatible with the new water heater, connecting the remote wiring and power supply. In many cases, existing wiring can be reused, allowing for replacement without damaging the walls.
We will check for gas leaks using a gas leak detector, confirm there are no water leaks in the piping, and then perform a test run to ensure the water temperature, automatic filling, and reheating functions operate correctly. We will explain how to use the remote control, and the replacement will be complete.
Service Areas
Based in Aoba-ku, Yokohama, we primarily serve Kanagawa Prefecture and Tokyo. We can also accommodate some areas in Chiba Prefecture and Saitama Prefecture, so please feel free to consult with us.
View service areas in Tokyo
Akishima City / Akiruno City / Adachi Ward / Arakawa Ward / Itabashi Ward / Inagi City / Edogawa Ward / Ome City / Ota Ward / Katsushika Ward / Kita Ward / Kiyose City / Kunitachi City / Koto Ward / Koganei City / Kokubunji City / Kodaira City / Komae City / Shinagawa Ward / Shibuya Ward / Shinjuku Ward / Suginami Ward / Sumida Ward / Setagaya Ward / Taito Ward / Tachikawa City / Tama City / Chuo Ward / Chofu City / Chiyoda Ward / Toshima Ward / Nakano Ward / Okutama Town / Nishi-Tokyo City / Nerima Ward / Hachioji City / Hamura City / Higashi-Kurume City / Higashimurayama City / Higashiyamato City / Hino City / Fuchu City / Fussa City / Bunkyo Ward / Machida City / Mitaka City / Minato Ward / Musashimurayama City / Musashino City / Meguro Ward
View service areas in Kanagawa Prefecture
Aikou District, Aikawa Town / Ashigarakami District, Oi Town / Ashigarakami District, Kaisei Town / Ashigarakami District, Nakai Town / Ashigarakami District, Matsuda Town / Ashigarakami District, Yamakita Town / Ashigarashimo District, Hakone Town / Ashigarashimo District, Manazuru Town / Ashigarashimo District, Yugawara Town / Isehara City / Odawara City / Kamakura City / Kawasaki City / Kawasaki City, Kawasaki Ward / Kawasaki City, Asao Ward / Kawasaki City, Saiwai Ward / Kawasaki City, Takatsu Ward / Kawasaki City, Tama Ward / Kawasaki City, Nakahara Ward / Kawasaki City, Miyamae Ward / Koza District, Samukawa Town / Zushi City / Chigasaki City / Nakagun, Oiso Town / Nakagun, Ninomiya Town / Hadano City / Hiratsuka City / Fujisawa City / Miura District, Hayama Town / Miura City / Minamiashigara City / Yokosuka City / Yokohama City / Yokohama City, Aoba Ward / Yokohama City, Asahi Ward / Yokohama City, Izumi Ward / Yokohama City, Isogo Ward / Yokohama City, Kanagawa Ward / Yokohama City, Kanazawa Ward / Yokohama City, Konan Ward / Yokohama City, Kohoku Ward / Yokohama City, Sakae Ward / Yokohama City, Seya Ward / Yokohama City, Tsuzuki Ward / Yokohama City, Tsurumi Ward / Yokohama City, Totsuka Ward / Yokohama City, Naka Ward / Yokohama City, Nishi Ward / Yokohama City, Hodogaya Ward / Yokohama City, Midori Ward / Yokohama City, Minami Ward / Sagamihara City / Sagamihara City, Midori Ward / Sagamihara City, Minami Ward / Sagamihara City, Chuo Ward / Ebina City / Atsugi City
Kakeru Koumuten Co., Ltd.!
By replacing your old water heater with a new one, you can reduce the risk of suddenly being without hot water and save on utility costs. We will carefully check the installation type, capacity, and piping, and carry out the work with precision.
On-site surveys and estimates are free of charge. We also welcome competitive estimates, so please feel free to contact us.
Related Pages
We also welcome consultations via LINE!
We are also updating our Instagram regularly. Please follow us!
contact Kakeru Koumuten Co., Ltd.
Kakeru Koumuten is a young company whose team is, on average, in their late twenties, but our skills are second to none.
Our greatest strength is that we handle scaffolding, roofing and painting entirely in-house. In an industry where these tasks are usually divided among contractors, our complete service simplifies project management and helps keep costs down. Above all, if a problem arises, we respond promptly.
We proudly describe ourselves as the youngest and most helpful renovation company in Kanagawa!
