Construction Menu | Costs for Water Heater Replacement and EcoCute Installation
<!– Recommended Page Title: Cost and Procedure for Water Heater Replacement|Kakeru Koumuten Co., Ltd. in Aoba-ku, Yokohama Recommended Slug: service-menu-water-heater-replacement Theme: JIN 8.3 Compatible (using common CSS kakeru-menu.css) ■Operational Method (Unified with Common CSS) 1. CSS is consolidated into the common class .kakeru-menu, and only kakeru-menu.css has been registered in the plugin “Custom CSS & JS.” 2. Only the HTML of
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should not be pasted).
3. Excerpts and AIOSEO meta descriptions should be manually entered instead of relying on automatic generation.
*This file is a self-contained version that combines common CSS and main HTML for preview confirmation.
*Images will use existing uploads (wp-image-679xx). Please replace the URL in the related page “★Bathroom Replacement Page URL” with the URL of the bathroom (unit bath) replacement work page.
■Recent Additions (2026-09-08)
・Added “Cost Estimates by Size (Number)” to the cost section (card format for 16, 20, and 24 sizes / table not used as it interferes with JIN)
・Established a new section “Subsidies and Grants Available for Water Heater Replacement” (Energy-saving Water Heater 2026 Project / Future Eco Housing 2026 Project / Local Government)
・Minor adjustments: Removed unnecessary
and empty elements within the construction results card.
Remove, supplement the alt text for achievement images
–>
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給湯器の交換工事は、設置場所や配管の状況によっても費用が変動します。詳しい見積もりは、ぜひお気軽にお問い合わせください。
This is an energy-saving type of gas water heater that reuses exhaust heat to heat water. It reduces gas consumption compared to conventional models, leading to savings on utility bills. It may be eligible for subsidies from the government or local authorities.
Major manufacturers (products)
Noritz “GT-C62 Series”・Rinnai “RUF-E Series”
This is an electric water heater that uses heat from the air to heat water and store it in a tank for use. It can utilize off-peak electricity and is well-suited for all-electric homes and solar power systems.
Major manufacturers (products)
Mitsubishi Electric “SRT Series”・Panasonic “HE Series”
Estimated Costs by Size (Number)
The “number” of gas water heaters indicates the estimated amount of hot water that can be used at one time. For households that use hot water in multiple places simultaneously, a larger number is recommended. Even for the same number, costs vary depending on whether it is for hot water only, auto, or full auto.
Estimated for 1-2 person households
This number is suitable for single-person to two-person households where hot water is rarely used simultaneously.
Auto and Full Auto start from approximately 140,000 yen~
Estimated for 2-3 person households
This is a standard number that maintains water pressure even when using the shower and hot water simultaneously. It is the most commonly chosen for single-family homes.
Auto and Full Auto start from approximately 160,000 yen~
Estimated for 3-4 or more persons
This number can supply hot water simultaneously to multiple locations, such as the kitchen and bathroom. It is recommended for larger households.
Auto and Full Auto start from approximately 190,000 yen~
※ The price of the unit varies depending on the number (16, 20, 24) and features.
※ For the costs of Eco-Joos (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 eco-cute 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
Subsidies and Grants Available for Water Heater Replacement
Replacing to a high energy-efficient water heater may qualify for national subsidies. In particular, eco-cutes and Enefarms 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 eco-cutes and Enefarms. The subsidy amount is determined for each device, with the following estimates per unit:
- Eco-cute (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)
- Enefarm (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-Joos and general gas water heaters are not eligible for this project.
Eco-Joos (condensing gas water heaters) and Eco-Feels, 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-Joos is 30,000 yen/unit. 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.
View detailed information on renovation subsidies and grants
Track Record of Water Heater Replacement Work
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.
For those who want to know the cost of water heater replacement
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-Joos” that reuse exhaust heat, and “Eco-Cute” that heats water using electricity and a heat pump.
The capacity of a gas water heater is expressed in “number,” indicating how many liters of water at a temperature of +25°C can be supplied per minute. Generally, a 16 number is suitable for 1-2 people, a 20 number for 2-3 people, and a 24 number 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-Joos 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
Points to Consider for Water Heater Replacement Work
If a household uses hot water in multiple places simultaneously and has a small number, the water pressure in the shower may weaken. We will propose options based on the current number, 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-Joos and Eco-Cute 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.
If you are considering a bathroom replacement, we recommend doing it “simultaneously with the water heater 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 water heater is suitable for your home?
We will check the installation type, number, piping, and eligibility for subsidies during the on-site survey.
Construction Procedure for Water Heater Replacement

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, Yamato 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, model number, 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.


