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Serving San Francisco & Peninsula Since 1954
Upfront pricing, background-checked technicians, and honest local craftsmanship you can trust.
Heise's Plumbing provides professional, licensed tankless water heater installation, replacement, annual descaling, and repair services throughout San Francisco and the Peninsula. Tankless systems supply continuous hot water while using up to 30% less energy than traditional storage tanks. Our experienced plumbers handle the entire scope of work, including gas line capacity evaluations, ventilation updates, annual descaling, and error code diagnostics.
Heise's Plumbing offers a complete range of services for gas and electric tankless systems, ensuring reliable operation, code compliance, and energy savings for residential and commercial customers:
Our technicians are highly trained to install and repair all major brands of gas, propane, and electric tankless water heaters:
Known for advanced condensing technology, dual stainless steel heat exchangers, and excellent high-efficiency output.
Industry leader offering robust reliability, smart-circ recirculation pumps, and residential warranties up to 15 years.
Engineered with high-quality copper and stainless steel components, offering durable solutions for active households.
Offers versatile gas and electric models, integrated leak detection sensors, and user-friendly digital diagnostics.
We also install and repair tankless models from other reputable brands, including A. O. Smith, Takagi, Bosch, Bradford White, State, EcoSmart, and Stiebel Eltron. Our diagnostic equipment allows us to read custom error codes and replace original manufacturer parts to restore your unit safely.
Evaluating the advantages and disadvantages of both systems will help you choose the ideal option for your property's demands and budget:
While tankless heaters are highly efficient, converting your property requires evaluating technical requirements to ensure a reliable system:
Use this quick selection guide to map your household preferences to the most suitable water heater technology:
| If you want... | Best Choice |
|---|---|
| Lowest upfront cost | Traditional Tank |
| Maximum energy efficiency | Hybrid Heat Pump |
| Save physical floor space | Tankless Water Heater |
| Unlimited continuous hot water | Tankless Water Heater |
| Fastest emergency replacement | Traditional Tank |
| Lower monthly utility bills | Hybrid Heat Pump or Tankless |
| Small mechanical room or remodel layout | Tankless Water Heater |
| Replacing an existing electric water heater | Hybrid Heat Pump |
| Large family with high peak demand | Properly Sized Tankless or Large 75-Gallon Tank |
| Home without natural gas line access | Hybrid Heat Pump or Electric Tank |
Separating fact from fiction helps homeowners set realistic expectations for their plumbing upgrades:
The Reality: Tankless systems supply *continuous* hot water, but not instant water. Hot water must still travel through your home's pipes from the unit to the faucet. Travel time remains the same unless a dedicated hot water recirculation pump and loop are integrated.
The Reality: Mineral scale accumulates inside the compact copper heat exchangers over time. Gas and electric units must be flushed and descaled with food-grade solution once every 12 months to prevent element cracking and maintain energy savings.
The Reality: Sizing limits exist. A single unit has a maximum flow rate measured in Gallons Per Minute (GPM). If three showers, a dishwasher, and a washing machine run at the exact same time, demand may exceed the system's capacity, causing water to run cool. Sizing checks ensure the correct model is specified.
Bay Area municipal water contains hard minerals like calcium and magnesium. These minerals solidify on the heat exchanger. An annual scale clean-up preserves water flow pressure, keeps heating efficiency high, and prevents heat exchanger cracking. If you configure a hybrid electric system, we recommend checking elements as well. For alternative electric technologies, you may also consider our Heat Pump Water Heaters page.
For over 70 years, Heise's Plumbing has set the standard for quality home services in San Francisco and the Peninsula. We are fully licensed (CA Contractor License #1089561) in General Engineering (A), Plumbing (C36), Electrical (C10), and HVAC (C20). Homeowners trust our background-checked technicians and upfront pricing. We manage all municipal permit codes, ensuring your gas or electric tankless installation matches seismic and venting safety guidelines.
We provide prompt tankless plumbing service throughout San Francisco, Daly City, South San Francisco, San Bruno, Millbrae, Burlingame, San Mateo, Belmont, San Carlos, Redwood City, Menlo Park, and Palo Alto. We double-test all gas connections and vent integrity to guarantee reliable operation.
Our technicians inspect the flow sensors, read control board error codes, test the burner assembly, and check gas pressure manifolds to identify the failure.
We isolate the system, flush the heat exchanger with food-grade descaling solution, replace faulty sensors or valves, and verify correct combustion and gas pressure settings.
San Francisco's mineral water chemistry accelerates scale build-up inside copper heat exchangers. Regular annual flushing is critical to prevent code failures and protect tankless warranties.
For over seven decades, Heise's Plumbing has set the standard for quality home services in San Francisco and the Peninsula. We are fully licensed and bonded (CA Contractor License #1089561) in General Engineering (A), Plumbing (C36), Electrical (C10), and HVAC (C20). Homeowners and property managers trust our neat, background-checked technicians and our straightforward, upfront pricing.
Explore real jobs completed by our local plumbing technicians.
The cost of installing a tankless water heater varies based on venting changes, fuel line upgrades, and unit capacity. We provide detailed, upfront estimates before beginning any work.
Yes. Properly sized units (typically 5 to 7 GPM) can easily supply hot water to multiple bathrooms, showers, and appliances simultaneously in a standard household.
We recommend descaling and flushing the system once every 12 months. Homes with hard water may require flushing every 6 to 9 months to maintain thermal efficiency.
Yes. We specialize in converting traditional tank water heaters into space-saving tankless configurations, managing all gas venting and plumbing updates.
Often yes. Gas tankless units require high BTU ratings to heat water instantly. Standard 1/2-inch gas lines may need an upgrade to 3/4-inch to maintain gas pressure.
Tankless systems generally last 20 years or more with proper descaling and maintenance, roughly double the lifespan of standard storage tanks.
Error codes indicate specific issues like venting blockages, ignition errors, or scale buildup. Our technicians use code charts to diagnose and repair issues rapidly.
No. Gas tankless systems still require electrical power to run the digital control boards, igniters, and safety sensors. Backup battery generators can be added.
Our local tankless water heater installation and repair experts are ready to help throughout San Francisco and the surrounding Peninsula areas.
