Boiler replacement cost
What drives the price of a boiler or water heater replacement, and how to get a firm quote.
Apartment Building Boiler Replacement in California
Replacing the boiler that makes your building's hot water, without leaving residents without it. For California apartment, condo, senior and affordable housing buildings.
- California multifamily onlyApartment, condo and affordable housing buildings.
- Central plants and in-unit heatersWater heaters, DHW boilers and central heat pumps.
- Incentive check includedCurrent program status reviewed for your address.
- Free, no-obligation assessmentFor owners, managers and authorized representatives.
Apartment building boiler replacement is rarely just a boiler swap. The tanks, pumps, mixing valve, venting and controls around it decide whether the new plant fixes the problems residents complain about.
DHW boiler or space-heating boiler?
Many California apartment buildings use a boiler only for domestic hot water (DHW): showers, sinks and laundry. Some older buildings also have a boiler for heating apartments.
This page covers DHW boilers. If one boiler does both jobs, note it in the form so the survey covers both connections.
Signs your boiler is failing
- Residents losing hot water at morning and evening peaks
- Leaks at the boiler, storage tanks or heat exchanger
- Repeated lockouts, ignition faults or tripped safety controls
- Corrosion, scale or soot around the burner and venting
- Parts that are discontinued, and repair calls that keep coming back
Property managers often ask whether a 10-unit building and a 90-unit building face the same decision. The questions are the same. The bigger the building, the more the cutover plan matters.
Apartment building boiler replacement options
Retaining a worn tank or an unreliable pump can leave the original complaint unresolved. Ask each proposal to say what it replaces and what it keeps.
Cutover and temporary boiler rental
In an occupied building, the shutdown is the riskiest day of the project. Plan it before ordering equipment.
- Staged swap: keep one boiler or heater running while another is replaced, where the piping allows.
- Temporary boiler or water heater: a rental unit connected to the system for the changeover. It needs space, gas or power, and connection points.
- Short planned outage: sometimes simplest, with resident notice and a fixed window.
The replacement process
- Survey. The plant, connected tanks, pumps, venting, gas supply and access route are recorded.
- Engineering. Demand and storage are checked, and equipment is selected.
- Permits and air-district rules. Local permits are pulled. Air-district limits on boiler emissions can affect which models are allowed.
- Installation and cutover. Equipment is set, connected and switched over on the agreed plan.
- Commissioning. Temperatures, controls and recirculation are tested, and records are handed to your team.
Timeline
The schedule follows the survey. The main things that set it are equipment lead times, permit review, crane or access arrangements and how the cutover is staged. The contractor gives dates once those are known.
Cost
Cost depends on the equipment, venting, gas supply, access and cutover plan. Read the boiler replacement cost guide for the full list of drivers.
Owner questions
Apartment building boiler questions
How do apartment building boiler systems work?
A domestic hot water boiler heats water in a loop through one or more storage tanks. Hot water leaves the tanks, passes a mixing valve that limits the temperature at the taps, and travels around the building in a recirculation loop. A pump returns the cooled water to the plant to be reheated.
What temperature should a boiler be set to in an apartment building?
There are two temperatures to think about: the storage temperature, which is set partly to control bacteria growth, and the delivered temperature at taps, which the mixing valve limits to prevent scalding. Both are design and code decisions for your system. Ask the contractor to record them at commissioning.
Can we replace one boiler at a time?
Often, if the plant has more than one boiler or water heater and the piping lets each one be isolated. Staged replacement keeps part of the plant live and can avoid a full shutdown.
Do you replace space-heating boilers?
This page covers boilers that make domestic hot water. If your boiler also heats apartments through radiators or fan coils, say so in the form, because the scope and the contractor may be different.
Related guides
Central heat pump water heaters
Equipment types, storage, siting and electrical readiness for a central plant.
Commercial water heater replacement
Replacing central or multi-unit water heaters in an occupied building.
Multifamily water heater rebates
California programs to check, with dated status and an eligibility checklist.
Water heaters for apartment buildings
The three ways apartment buildings make hot water, and how to choose.
Planning a replacement at an occupied building?
Send the building details once. Qualified requests go to a California contractor partner for a free, no-obligation assessment and quote.
Two short steps
Request a free assessment
The assessment and quote are free, with no obligation. Tell us about the building and the hot water equipment that serves it. An uncertain equipment age is fine.
- Central plants, DHW boilers and in-unit heaters at California multifamily properties
- With your consent, details go to a qualified California contractor partner who follows up
- Helpful later: nameplate photos, recent service notes and access constraints
This form is not an emergency dispatch service. If hot water has stopped, use the building's existing maintenance contacts.