Same-DayDiagnosis
ResidentialCommercial
California Lic.#1091355
Same-Day DiagnosisResidential • CommercialCalifornia Lic. #1091355
We install condensing tankless units from Navien, Rinnai, and Noritz — interior or exterior, gas or propane.
We handle full conversions including gas upsizing, venting, condensate, and recirculation.
Our team handles error-code diagnosis, flame-rod and fan replacement, and control-board service.
We perform annual flush, inlet filter service, and burner inspection to protect the heat exchanger.
Diagnostics, descaling, maintenance, warranty support, and recirculation troubleshooting on NPE-A2, NPE-S2, and legacy Navien tankless platforms.
ABC Service sizes tankless units to actual fixture demand and incoming groundwater temperature — not the marketing GPM rating on the box. Gas line capacity is verified with a manometer under load, venting is run to manufacturer spec, and combustion is measured with an analyzer at commissioning.
Most tank-to-tankless conversions require more than swapping the appliance. We upsize the gas line where the calculation demands it, reroute or add stainless or PVC venting to manufacturer spec, run condensate drainage, and add a recirculation strategy so the homeowner doesn't trade a slow recovery for a long hot-water wait.
Our team diagnoses error codes, flame-rod and ignition faults, fan and inducer failures, flow-sensor issues, and control-board problems on the dominant Bay Area brands. We stock common consumable parts so most repairs are completed on the first visit instead of waiting on shipping.
Annual descaling with a calibrated pump and proper chemistry preserves heat-exchanger capacity, protects the manufacturer's warranty, and is the single biggest factor in pushing a condensing tankless past the 15-year mark in Bay Area water conditions.
Sized correctly, a tankless never runs out — even with simultaneous showers and a tub fill.
Condensing tankless models hit 0.93–0.96 UEF, with no standby losses from a hot tank sitting idle.
Wall-mounted units recover floor space in garages and mechanical rooms.
Most tankless complaints come from undersized gas, bad venting, or no recirculation — all preventable.
%20--%3e%3csvg%20version='1.1'%20id='Layer_1'%20xmlns='http://www.w3.org/2000/svg'%20xmlns:xlink='http://www.w3.org/1999/xlink'%20x='0px'%20y='0px'%20viewBox='0%200%20310%2075'%20xml:space='preserve'%3e%3cstyle%20type='text/css'%3e%20.st0{fill:%23CF000F;}%20%3c/style%3e%3cpath%20class='st0'%20d='M44,45.1c3.2-1.1,12-4,12-18.9S46.2,5.9,28.9,5.9H4.5c-0.9,0-1.6,0.7-1.6,1.5c0,0,0,0,0,0v63.5%20c0,0.9,0.7,1.6,1.6,1.5c0,0,0,0,0,0h12c0.9,0,1.6-0.7,1.6-1.5c0,0,0,0,0,0V46.5h9.4l16.7,24.1c0.8,1.2,2.1,1.9,3.6,1.9h12.9%20c0.7,0,1.2-0.6,1.2-1.3c0-0.2-0.1-0.4-0.2-0.6L44,45.1z%20M27.2,35.9h-9.1V16.4h9.1c7.4,0,13.5,1.3,13.5,9.7S34.6,35.9,27.2,35.9z'/%3e%3ccircle%20class='st0'%20cx='74.3'%20cy='10.4'%20r='7.9'/%3e%3cpath%20class='st0'%20d='M68.3,21.8h12c0.9,0,1.6,0.7,1.6,1.6v47.5c0,0.9-0.7,1.6-1.6,1.6h-12c-0.9,0-1.6-0.7-1.6-1.6V23.4%20C66.7,22.5,67.4,21.8,68.3,21.8z'/%3e%3cpath%20class='st0'%20d='M121.8,20.5c-11.3,0-14.6,4.7-16.5,6.6v-3.8c0-0.9-0.7-1.6-1.6-1.6c0,0,0,0,0,0H91.9c-0.9,0-1.6,0.7-1.6,1.6%20v47.5c0,0.9,0.7,1.6,1.6,1.6c0,0,0,0,0,0h12c0.9,0,1.6-0.7,1.6-1.6c0,0,0,0,0,0V44c0-6.9,4.2-12,11.1-12c7.5,0,11.1,5.3,11.1,12%20v26.9c0,0.9,0.7,1.6,1.6,1.6h12c0.9,0,1.6-0.7,1.6-1.6V40.3C142.9,25.5,132.6,20.5,121.8,20.5z'/%3e%3cpath%20class='st0'%20d='M182.7,20.5c-11.3,0-14.6,4.7-16.5,6.6v-3.8c0-0.9-0.7-1.6-1.6-1.6c0,0,0,0,0,0h-11.8c-0.9,0-1.6,0.7-1.6,1.6%20v47.5c0,0.9,0.7,1.6,1.6,1.6c0,0,0,0,0,0h12c0.9,0,1.6-0.7,1.6-1.6c0,0,0,0,0,0V44c0-6.9,4.2-12,11.1-12c7.5,0,11.1,5.3,11.1,12%20v26.9c0,0.9,0.7,1.6,1.6,1.6h12c0.9,0,1.6-0.7,1.6-1.6V40.3C203.8,25.5,193.5,20.5,182.7,20.5z'/%3e%3cpath%20class='st0'%20d='M227.3,21.9c-10.9,3-14.6,10.5-15.4,13.1c-0.2,0.6,0,1.2,0.6,1.5c0.2,0.1,0.4,0.1,0.6,0.1l13.5-0.1%20c0.5,0,1-0.2,1.3-0.5c2.9-3.6,7.1-4.4,11.1-4.2c9.8,0.6,9,8.5,9,9.1c-32.8-3-41,11.6-36.9,22.4c4.8,12.4,28.8,13.8,36.6,5.2%20c1,2.7,1.2,4,3.3,4h10.2c0.9,0,1.6-0.7,1.6-1.6v-30C262.8,19.3,238.5,18.8,227.3,21.9z%20M247.8,52.4c0,7.3-4.7,11.7-12.8,11.9%20c-6,0.2-11-2.4-11.1-6.3c-0.3-8.9,18.2-8.5,22.3-8.2c1.5,0.1,1.5,0.1,1.5,0.8L247.8,52.4z'/%3e%3ccircle%20class='st0'%20cx='278.4'%20cy='10.4'%20r='7.9'/%3e%3cpath%20class='st0'%20d='M272.5,21.8h12c0.9,0,1.6,0.7,1.6,1.6v47.5c0,0.9-0.7,1.6-1.6,1.6h-12c-0.9,0-1.6-0.7-1.6-1.6V23.4%20C270.9,22.5,271.6,21.8,272.5,21.8z'/%3e%3cg%3e%3cpath%20class='st0'%20d='M301.2,58.5c1.2,0,2.3,0.3,3.4,0.9c1.1,0.6,2,1.5,2.6,2.6c0.6,1.1,0.9,2.3,0.9,3.5c0,1.2-0.3,2.4-0.9,3.5%20s-1.5,2-2.6,2.6c-1.1,0.6-2.3,0.9-3.5,0.9c-1.2,0-2.4-0.3-3.5-0.9s-2-1.5-2.6-2.6c-0.6-1.1-0.9-2.3-0.9-3.5c0-1.2,0.3-2.4,0.9-3.5%20c0.6-1.1,1.5-2,2.6-2.6C298.9,58.8,300,58.5,301.2,58.5z%20M301.2,59.7c-1,0-1.9,0.3-2.9,0.8c-0.9,0.5-1.7,1.2-2.2,2.2%20c-0.5,0.9-0.8,1.9-0.8,2.9c0,1,0.3,2,0.8,2.9c0.5,0.9,1.2,1.6,2.2,2.2c0.9,0.5,1.9,0.8,2.9,0.8c1,0,2-0.3,2.9-0.8s1.7-1.2,2.2-2.2%20c0.5-0.9,0.8-1.9,0.8-2.9c0-1-0.3-2-0.8-2.9c-0.5-0.9-1.3-1.7-2.2-2.2C303.2,60,302.2,59.7,301.2,59.7z%20M298.1,69.4v-7.5h2.6%20c0.9,0,1.5,0.1,1.9,0.2c0.4,0.1,0.7,0.4,0.9,0.7c0.2,0.3,0.4,0.7,0.4,1.1c0,0.6-0.2,1-0.6,1.4s-0.9,0.6-1.6,0.7%20c0.3,0.1,0.5,0.2,0.6,0.4c0.3,0.3,0.7,0.8,1.1,1.5l0.9,1.5H303l-0.7-1.2c-0.5-0.9-1-1.5-1.3-1.8c-0.2-0.2-0.5-0.3-1-0.3h-0.7v3.2%20H298.1z%20M299.4,65.2h1.5c0.7,0,1.2-0.1,1.4-0.3c0.3-0.2,0.4-0.5,0.4-0.8c0-0.2-0.1-0.4-0.2-0.6c-0.1-0.2-0.3-0.3-0.5-0.4%20c-0.2-0.1-0.6-0.1-1.2-0.1h-1.4V65.2z'/%3e%3c/g%3e%3c/svg%3e)
We assess existing equipment, loads, venting, electrical, and site constraints on-site.
We size and specify equipment to the building — with options and trade-offs explained plainly.
A dedicated lead tech handles a permitted, clean install with finish-grade workmanship.
We start up, balance, and verify the system against design intent with calibrated instruments.
We walk you through operation, file rebates, and stand behind the system long-term.
Licensed C-10 Electrical, C-20 HVAC, and C-36 Plumbing — one team, one schedule, one point of accountability.
Fully licensed contractor, bonded, and carrying general liability and workers' comp insurance.
Urgent service and safety calls prioritized with same-day diagnosis when scheduling allows.
Serving homeowners, property managers, businesses, and commercial facilities throughout the Bay Area.
Flexible financing options may be available for qualified customers through GoGreen Financing — HVAC, heat pumps, boilers, water heaters, electrical upgrades, and EV chargers.
