
Type of work performed: Installed a commercial water heater A.O. Smith 200,000 BTU
Area of the room: ~4,000 sq ft (≈370 m²) of served commercial space
Material / technique used: A.O. Smith 200,000 BTU commercial water heater, re-tied into the existing copper manifold and circulation pumps for domestic + radiant loops.
Location: Saratoga, California
Project type: Commercial water heating + radiant heat
When one water heater serves two purposes—providing domestic hot water and supplying a radiant floor heating system—reliability is essential. This Saratoga property was leaning on an aging commercial tank that was past its prime. Our team swapped it for a new commercial water heater and re-tied it cleanly into the existing copper manifold and circulation pumps, so both the hot-water taps and the radiant floor loops run off one dependable, high-output unit.
Table of contents
The challenge
The existing commercial water heater fed both the domestic hot-water lines and a radiant floor heating system through a copper manifold and a bank of circulation pumps. It was getting old after years of service. And on a double-duty system, that’s a real risk: lose the heater, and you lose both the hot taps and the floor heat. The job was to be done without disturbing the existing manifold and pump configuration in a confined mechanical room at Saratoga, while replacing the heart of the system without re-plumbing all the other components around it.
The solution and the equipment
We installed a new 200,000 BTU A.O. Smith commercial water heater—high recovery rate, built for continuous commercial demand. The high BTU output is what lets a single tank keep up with two loads at once: domestic hot water on-demand plus a steady feed to the radiant floor loops. We connected it back into the existing copper manifold and circulation pumps, kept the flue and gas connections to code, and added the proper expansion control. If you’re weighing options for your own property, our guide on choosing the right water heater covers tank vs. tankless vs. hybrid and how to size for real demand.
| Component | What we installed | Why it matters |
|---|---|---|
| Water heater | A.O. Smith 200,000 BTU commercial unit | High recovery; keeps up with domestic + radiant demand together. |
| Manifold / loops | Re-tied to existing copper manifold + circulation pumps | Keeps domestic and radiant zones balanced without re-plumbing. |
| Flue & gas | Code-compliant venting + gas connection | Safe combustion and draft for a high-BTU commercial unit. |
| Expansion / safety | Expansion tank + T&P relief | Protects the system from thermal expansion and pressure spikes. |
If your current unit is showing its age, our rundown of the telltale signs you need a water heater replacement is worth a read before it fails on you. Replacing a commercial water heater of this size in California requires a permit and final inspection—it’s not optional for a unit this size or load. We pulled the permit with the City of Saratoga, scheduled the inspection, and signed off on the gas, venting, and expansion-tank work before closing up the mechanical room. That paper trail matters if you ever sell the property or file an insurance claim. For a broader efficiency comparison across commercial units, ENERGY STAR‘s rating guide is a useful reference.
Keep your business running
Key results
- One unit, two jobs—reliable domestic hot water and radiant floor heat from a single 200,000 BTU heater, replacing an aging unit rated at roughly 150,000 BTU.
- Faster recovery—the new unit recovers hot water roughly 30% faster than the old tank, keeping up with simultaneous domestic and radiant demand without lag.
- Clean tie-in, no re-plumb—reused the existing copper manifold and circulation pumps, keeping the job to a single day of downtime instead of a multi-day re-pipe.
- Fully permitted—installed under a City of Saratoga permit with final inspection sign-off on gas, venting, and expansion-tank work.
- Backed by warranty—covered by A.O. Smith’s manufacturer warranty (commercial tank and parts) plus our standard labor warranty on the installation.
Why a single high-output unit for two loads
Running domestic hot water and radiant heat off one properly sized, high-BTU heater keeps the mechanical room simpler and cheaper to maintain than juggling two systems. The key is recovery rate—how fast the heater reheats—which is why a 200K BTU commercial unit fits a building with real, simultaneous demand. For property owners in Saratoga and the nearby foothills—Los Gatos, Los Altos, and Cupertino—our smart business owner’s guide covers planning a mechanical-room upgrade before a failure forces your hand.
Maintenance tips
- Flush the tank annually—sediment kills efficiency and recovery, especially on hard Bay Area water.
- Check the anode rod every couple of years to protect the tank from corrosion.
- Test the T&P relief valve to confirm it’s working.
- Have the pumps and manifold inspected so the radiant loops stay balanced.
FAQs
Yes, when it’s sized for the combined load. A high-BTU commercial unit has the recovery rate to feed domestic taps and radiant loops at the same time through a shared manifold and circulation pumps.
It depends on peak simultaneous demand and recovery rate, not just tank size. We calculate the load from fixtures, occupancy, and any radiant or process loads, then size the BTU output to match.
A like-for-like swap that reuses the existing manifold and pumps is typically completed in a day, including draining the old unit, setting the new one, re-tying the connections, and testing. Re-piping or venting changes can add time.
If your commercial property in Saratoga or the nearby Bay Area—Los Gatos, Los Altos, Cupertino, Campbell — depends on an aging water heater for hot water or radiant heat, we can plan the replacement before it leaves you cold. Book a free, no-obligation water heater assessment in Saratoga.
Phone: (408) 733-2000
Email: info@airandplumbing.com
Air & Plumbing Systems has served the Bay Area since 2006—Licensed, Bonded & Insured (CSLB #901246), 4.8 stars on Yelp. Hablamos español. Call (408) 733-2000 for fast service or book your appointment online in just a few clicks.
Book your free assessment
What Our Clients Are Saying



