You’ve decided to get a new water heater. You figure it’s simple — the plumber comes, swaps it out, done. But if you ask any experienced Riverside County plumber, they’ll tell you there are several things that surprise homeowners during or after water heater installation. Here’s what Davis Plumbing wishes every customer knew beforehand.
1. You Probably Need a Permit (And That’s a Good Thing)
California requires a permit for virtually all water heater replacements — not just new installations. Many homeowners are surprised by this, especially when they’ve had a plumber quote a “no permit” job for less money. Here’s the reality: an unpermitted water heater installation is a code violation. When you sell your home, an unpermitted water heater can create major complications during escrow. Always insist on a permit. Davis Plumbing handles all permits and inspections as part of every installation.
2. Your Water Heater Has to Be Strapped — It’s California Law
All water heaters in California must be seismically strapped to resist falling during an earthquake. This isn’t optional, and an inspection will catch it if it’s missing. Any quote that doesn’t include seismic strapping is cutting a corner.
3. You Might Need an Expansion Tank (Even If You Didn’t Before)
If your home has a pressure-reducing valve (PRV) or backflow preventer — both common in Riverside County — your system is a “closed loop.” Thermal expansion from your water heater has nowhere to go, which creates dangerous pressure buildup. California code requires an expansion tank in these situations. Many homeowners have never had one, and are surprised to learn they need one. It adds $100–$175 to the job but it protects your plumbing and your new water heater.
4. Bigger Isn’t Always Better (But Too Small Is Always Wrong)
A 40-gallon tank sounds like plenty — until your family of five uses all of it before everyone has showered. Proper sizing is based on “first hour rating” (FHR), not just tank capacity. A good plumber will ask about your household size and peak demand before recommending a size. Undersized water heaters are one of the most common mistakes we see on homes with growing families.
5. Hard Water Will Shorten the Life of Your New Water Heater
Riverside County’s water is notably hard — meaning it has high dissolved mineral content. That mineral content becomes scale inside your water heater, reducing efficiency and lifespan. The fix is simple: an annual flush and anode rod inspection, or a water softener for the whole house. Skipping maintenance on a new water heater in our area is like buying new tires and never checking the air pressure.
6. That Rumbling Sound Isn’t Normal — It’s Expensive
If your existing water heater makes a rumbling, popping, or banging sound, it’s not just annoying — it’s a sign of significant sediment accumulation. That sediment bakes onto the bottom of the tank and acts as insulation between the heat source and the water, forcing your heater to run longer and hotter to reach temperature. By the time it’s loud, your unit’s efficiency has dropped substantially. Annual flushing prevents this.
7. Switching from Tank to Tankless May Require a Gas Line Upgrade
This surprises a lot of people. Tankless water heaters fire at much higher BTU rates than tank units — often 180,000–199,000 BTU vs. 36,000–40,000 BTU for a standard tank. Many older Riverside County homes were built with ½” gas lines that can’t supply enough volume for a high-demand tankless unit. A gas line upgrade from ½” to ¾” adds $300–$600 to the project but is required for proper operation. Always get this assessed before committing to a tankless system.
8. The Cheapest Water Heater Installation Quote Usually Isn’t the Cheapest Option
We hear it regularly: a homeowner got a quote $200–$300 cheaper than ours. When we ask what it included, the answer is usually: no permit, no expansion tank, no seismic strapping, no haul-away of the old unit, and sometimes a lower-grade unit. By the time you add permit fees, disposal costs, and a code-compliant installation, the “cheap” quote often costs more. Always compare apples to apples.
9. Your Water Heater Should Last Longer Than You Think — If You Maintain It
A Bradford White or Rheem tank water heater, properly installed and maintained with an annual flush and anode rod check every 3–5 years, can last 15+ years in Riverside County — even with our hard water. Most water heaters fail prematurely due to neglect, not defect. Spending $100–$150 per year on maintenance is significantly cheaper than a $1,200 emergency replacement when the tank fails on a Sunday morning.
Schedule Water Heater Installation the Right Way
Call Davis Plumbing and Heating Inc. at (951) 657-0393. We’ll do the job right — permit, code-compliant installation, proper sizing, and the honest advice you deserve. Serving San Jacinto, Hemet, Temecula, Murrieta, Menifee, Perris, and all of Riverside County.