Water heating for apartments, kitchens and facilities
Commercial Water Heaters in San Jose, CA
Hot water for many users at once, at the right temperature, without running out at peak hours. We size, install, repair and maintain commercial and multi-unit water heating systems, from single high-input tanks to multi-heater banks with recirculation. In San Jose, every replacement needs a City plumbing permit and inspection, which we handle.
- 24/7 dispatchEmergency line for every property
- Plumbing + HVACCSLB License #1101278 (C-36, C-20, A)
- 1-year labor warrantyLicensed, bonded and insured since 1986
- Google 4.9130+ reviews
Schedule a Call
Pick a time to talk with our commercial team about your properties.
Who We Work With
Property managers
Residential, commercial and industrial portfolios.
HOAs and condo associations
Shared systems and common areas.
Restaurants, retail and offices
Work scheduled around business hours.
Schools and public agencies
Prevailing wage and insurance requirements met.
Commercial Water Heater Services
Gas, electric and heat pump systems for commercial and multi-unit buildings.
Installation and replacement
High-input tanks, multi-heater banks and tankless arrays sized to peak demand, installed with venting, gas and permits.
Repair
Burners, igniters, gas valves, elements, controls, relief valves and leaks diagnosed and fixed.
Recirculation systems
Recirculation pumps and loops so far units and fixtures get hot water quickly.
Mixing valves
Thermostatic mixing valves that let storage run hot while delivering safe temperatures at fixtures.
Maintenance
Flushing, descaling, anode and relief valve checks, and combustion and venting tests.
No-hot-water emergencies
24/7 response when a building or kitchen loses hot water.
What Sets Our Commercial Water Heater Work Apart
Sized to your peak
We size from your actual peak demand, not just the old heater's label.
Plumbing and controls together
Venting, gas, recirculation and mixing valves designed as one system.
Planned replacements
Old heaters replaced on your schedule, before a failure leaves residents without hot water.
Code compliance
Permits, seismic bracing, relief valve piping and inspections handled.
How a Commercial Water Heater Replacement Works
Survey
Current equipment, venting, gas or electrical capacity, and demand.
Size and design
Storage, recovery and recirculation sized to peak use.
Proposal
Equipment options and a custom quote.
Install
Scheduled to keep hot-water downtime short, with notices for residents.
Commission
Temperatures, combustion, recirculation and safety controls verified; inspection scheduled.
Recent Water Heater Projects
Commercial water heater installation, Santa Clara
Two commercial water heaters installed with new copper piping.
Church water heater replacement
A church's water heater kept malfunctioning. We diagnosed it, explained the options and replaced it, with the work tailored to a larger community building.
Pricing and Service Agreements
Clear pricing
Service and repair work is priced at a flat rate or on an hourly basis. Larger projects, such as repipes, sewer replacement and equipment installations, are custom quoted.
Service agreements
Flexible service agreements and payment terms for property managers and associations, and scheduled maintenance for plumbing and HVAC. Maintenance plans.
24/7 emergency response
Call (408) 978-3093 any time for leaks, backups and no-heat or no-cooling calls. Emergency work is priced separately.
CPI and Alex were extremely helpful when our local church’s water heater kept malfunctioning and needed replacing. From the initial diagnosis, explanation and recommendation of replacement, we always felt that our needs were being tailored to. Not only were they extremely kind, knowledgeable and professional, but they also were diligent and efficient during their time.
We’re truly grateful for their excellent work and would highly recommend CPI to anyone in need of plumbing or heating services, especially for those in larger community buildings like churches like ours.
Stephen S.Google review
Antonio did an excellent job fixing the water heater room noise issue. He took the time to properly diagnose the root cause instead of just treating the symptoms, which I really appreciated.
He went through multiple steps to resolve it, including draining and cleaning the water heater and adding vibration pads between the water pipes and the wall to reduce the noise transmission.
He was professional, thorough, and clearly knows what he’s doing. Highly recommend Antonio if you’re dealing with similar issues.
Nina F.Google review
Great, reliable, and timely service at a reasonable price. I shopped around quite a bit before landing on CPI. Their rates were competitive, they responded promptly, and their plumber fixed a few issues quickly and without much fuss. I’ll definitely be calling them again the next time we have issues!
Allan H.Google review
Commercial Water Heating: What to Plan For
Peak demand
Apartment buildings peak in the morning; kitchens at service times. Sizing balances storage with recovery so the peak never runs the system cold.
Temperature and safety
Storing water hotter reduces bacteria growth; thermostatic mixing valves then deliver safe temperatures at fixtures.
Permits and bracing
Replacements need a permit and inspection, and California requires water heaters to be braced against earthquakes.
Air District rules
Bay Area Air District rules are phasing in zero-emission standards for gas water heaters; check the timing for your equipment size before choosing a replacement.
Choosing a Commercial Water Heating System
Storage tanks and multi-heater banks. Several high-input tanks piped together share the load and keep hot water available if one unit needs service. This is the most common setup in apartment buildings.
Tankless arrays. Multiple tankless units staged together deliver continuous hot water for steady loads. They need adequate gas supply and venting, and regular descaling with South Bay water.
Heat pump systems. Commercial heat pump water heaters cost less to run and avoid combustion, but need electrical capacity, space and careful sizing for recovery.
Recirculation and Temperature Control
In larger buildings, water cools in the pipes between uses. A recirculation loop keeps hot water moving so far units don’t wait, and a thermostatic mixing valve lets the storage temperature stay high while fixtures get water at a safe temperature. Kitchens may need higher temperatures at specific equipment, which we plan into the design.
Planning a Replacement
Water heaters give warning: rust at fittings, rising sediment noise, leaks at the base, and more frequent repairs. Replacing a bank on your schedule, with notices to residents and a short switch-over, beats an emergency replacement on a winter morning. In San José, a like-for-like gas tank replacement in a commercial or multifamily building can be permitted online, while a different type of heater or a new location needs plans and the City’s standard plan review; planning ahead leaves time for that. See our blog post on a commercial water heater installation in San Jose.
Outside San Jose, we install and service commercial water heaters in Campbell, Cupertino and Milpitas, and in the other cities on our service area page.
Sources
- City of San José: Water heater permits
- California Health and Safety Code §19211: Water heater bracing
- Bay Area Air District: Building appliance rule implementation (Rule 9-6 water heaters)
Checked October 2026.
Commercial Water Heaters FAQs
How do you size a commercial water heater?
From peak demand: the number of fixtures, units or seats, when they're used, and the temperature needed. We balance storage capacity with recovery rate so peak hours don't run out.
Tank, tankless or heat pump?
Large tanks and multi-heater banks suit most apartment buildings; tankless arrays suit some restaurants and offices; heat pump systems are an option where electrical capacity allows. We compare them for your building.
How is this work priced?
Service and repair work is priced at a flat rate or on an hourly basis. Larger projects are custom quoted after we see the site. Emergency and after-hours work is priced separately.
How long will residents be without hot water during a replacement?
We plan the switch-over to keep downtime short, usually within a single working day, and coordinate notices with you.
Do you service church and nonprofit water heaters?
Yes, including larger community buildings.
Need a reliable plumbing and HVAC partner for your properties?
- CSLB License #1101278 (opens CSLB in a new tab): C-36 Plumbing · C-20 HVAC · A General Engineering
- 1-year labor warranty on our work
- BBB A+ Accredited Business (opens BBB in a new tab)
- Technicians trained and certified: NASSCO PACP, MACP and LACP · Rheem heat pump · Noritz Level 3 tankless · OSHA safety
- Member of IAPMO, NASSCO, BOMA, IFMA · Se habla español