Tankless Water Heater Oceanside | Williams Mechanical Co
Oceanside has a large stock of older homes still running aging tank water heaters — and most of them are overdue for a conversion. Williams Mechanical Co installs the Noritz EZTR40, a Japanese-made all-in-one conversion kit with venting included, making it the cleanest swap for most Oceanside homes. For homes where the furnace shares a flue with the water heater, we recommend the Navien NPE with dedicated PVC venting. Either way, one crew handles everything start to finish.
Frequently Asked Questions
How much does a tankless conversion cost in Oceanside?
Most full conversions with the Noritz EZTR40 run around $5,000 — that includes the unit, all-in-one venting kit, and installation. Homes with shared furnace flues may need dedicated venting which can affect the final price. Free estimates always.
My Oceanside home is older — can it handle a tankless water heater?
Yes, and it's one of the best upgrades you can make in an older home. We assess your gas line size, venting situation, and electrical before recommending a unit — no surprises on install day. If you need hot water during the conversion, we offer rental water heaters so you're never without.
What if my furnace shares a vent with my water heater?
Common in older Oceanside homes. When the furnace and water heater share a flue, the tankless unit needs its own dedicated vent run. In that case the Navien NPE is often the better fit since it uses smaller PVC exhaust. We quote it accurately after seeing the existing setup.
Call (760) 908-8896 for a Free Estimate
Full tankless conversion from $5,000 — Noritz EZTR40 unit, venting, install included. Free estimates, Wisetack financing available.
Most tankless water heater conversions in Oceanside take one to two days from start to finish. Our crew handles everything — gas line work, venting, installation, and cleanup. If you need hot water during the conversion, Williams Mechanical Co offers rental water heaters so your household is never without hot water. We show up on time, work clean, and leave the job site the way we found it.
Why Choose Williams Mechanical Co
Williams Mechanical Co is one of the few contractors in the Oceanside area holding three active CSLB licenses — C36 Plumbing, C10 Electrical, and C20 HVAC. That means when your tankless conversion requires a gas line upgrade or an electrical panel update, we handle it in-house. No subcontractors, no coordination headaches. We are factory trained and authorized installers for Navien and Noritz, and we are veteran owned and operated. Wisetack financing is available for qualified customers.
Serving Riverside and San Diego
Oceanside has one of the highest concentrations of pre-1990 homes in San Diego County — many still running the original tank water heaters they were built with. These aging units are inefficient, unreliable, and often undersized for today's households. The city also has a large active duty and veteran military population near Camp Pendleton, many of whom are upgrading before PCS moves or after purchasing a home. Williams Mechanical Co understands the Oceanside market and regularly works in Fire Mountain, South Oceanside, and Rancho Del Oro.
Federal Tax Credit
Many high-efficiency tankless water heaters — including qualifying Navien and Noritz models — may be eligible for a federal energy efficiency tax credit of up to 30% under the Inflation Reduction Act. This could put up to $1,500 back in your pocket. We recommend consulting your tax professional to confirm eligibility for your specific installation and circumstances.
