How Much Does a Tankless Water Heater Cost in the Inland Empire?
A tankless water heater costs more upfront than a tank replacement. How much more depends primarily on what the gas line and venting situation is. The unit itself is only part of the total. The figures below are from national cost-research publications. They are not Biz-E-Bee prices, and they are not specific to Southern California. The actual cost for your home depends on what a licensed plumber finds on-site.
What drives the cost of a tankless water heater?
Four cost centers account for most of the variation between jobs. Understanding them makes it easier to evaluate a quote.
Gas vs. electric
Gas tankless units require a gas supply line sized to the unit's peak demand and a dedicated direct-vent or power-vent exhaust, both of which are separate cost items from the unit itself. Electric units require sufficient panel capacity and the right wiring. Gas line and venting prep are real additions to the total cost of a gas installation.
Flow rate and size
Tankless units are sized by flow rate, gallons per minute, not by gallons of storage. A unit sized for one or two simultaneous uses costs less than one sized for a large household running back-to-back showers, a dishwasher, and a washing machine at the same time. Undersizing is a common reason a tankless unit can't keep up after installation. The plumber sizes the unit to your actual peak demand before quoting.
Tank-to-tankless conversion
Replacing a tankless unit with another tankless unit is a simpler job than converting from a tank. A conversion involves checking and potentially upsizing the gas line, installing proper venting (a tank's B-vent often can't be reused), adding a condensate drain if the new unit is a condensing model, and pulling a permit. Most of the cost gap between a tank replacement and a tankless conversion sits in this prep work, not in the unit.
Permits and site conditions
A permit is usually required for a tankless installation, and the inspection covers the gas line, venting, and electrical work. Older homes in Riverside County and San Bernardino County may need additional gas line or electrical upgrades before the unit can be installed. These are real line items on a tankless invoice and are part of what a site assessment determines before work begins.
Published national cost ranges
These figures are from national cost-research publications. They are not Biz-E-Bee prices, and they are not specific to Southern California. Labor rates, permit costs, and local conditions in Riverside County and San Bernardino County may differ. The only accurate number for your home is a quote from a licensed plumber who has assessed it.
| Service | Published range | Source |
|---|---|---|
| Tankless water heater installation, typical range | $1,333–$3,721 | Bob Vila (2023) |
| National average installed | $2,527 | Bob Vila (2023) |
| Labor | $600–$1,850 | Bob Vila (2023) |
| Tankless water heater installation, typical range | $2,500–$4,500 | Fixr (2025) |
| Average installed, 150,000 BTU gas model | $2,811 | Fixr (2025) |
| Electric, total costs (labor + unit) | $1,000–$3,000 | Fixr (2025) |
| Gas, total costs (labor + unit) | $1,400–$3,500 | Fixr (2025) |
| Tank water heater, installed (3–5 people, moderate usage) | $800–$2,500 | Fixr (2025) |
| Central unit only | $800–$3,000 or more | CostHelper (undated) |
| Central unit + installation | $1,800–$4,500 | CostHelper (undated) |
| Permits and inspections | $45–$200 or more | CostHelper (undated) |
| Maintenance visit | $45–$400 per visit | Fixr (2025) |
Note: Bob Vila (2023) and Fixr (2025) publish different ranges. The figures that apply to a specific home are the ones in a quote based on what a plumber finds on-site.
Tank vs. tankless: how the upfront cost compares
The two figures below are from Fixr (2025) and cover installed cost (unit plus labor). They are national figures. The actual difference for a specific home depends on what prep work the tankless installation requires.
Tank water heater
A tank replacement is a more straightforward job when the existing gas line and venting are already in place. The unit stores a fixed volume of water and keeps it hot continuously.
Fixr (2025): Tank water heater, installed (3–5 people, moderate usage): $800–$2,500
Tankless water heater
A tankless installation costs more because it may require gas line upsizing, new venting, and a permit in addition to the unit and labor. The tradeoff is hot water that does not run out and no standby heat loss from keeping a tank full. For a home staying in the family, the math is different than for a home selling in a short time.
Fixr (2025): Tankless water heater, installed (whole-house): $2,500–$4,500
What a tank-to-tankless conversion involves
A tankless unit draws significantly more gas at peak demand than a tank does, so the existing supply line has to be checked and may need to be upsized to meet the unit’s requirements. A plumber sizes the gas line before quoting, so the need for an upgrade, and its cost, is known before any work begins.
Venting is the other common prep item. A tank water heater uses a B-vent, which a tankless unit often can’t reuse. Most tankless units require a direct-vent or power-vent exhaust, which may mean running new vent pipe to the exterior. Condensing models also require a condensate drain, a small but real addition to the scope of a conversion.
Fixr (2025) puts adding the gas line at approximately $500 when switching from a traditional water heater, and a gas tank-to-tankless conversion at about $1,700, including adding the gas line. These are national figures. What the conversion actually involves for a specific home is what a site assessment determines.
What to look for in a conversion quote: unit, labor, gas line sizing and upsizing if needed, venting, permit, and haul-away of the old unit, all in one number before work begins. A quote that covers only the unit does not reflect what the full installation will cost.
Ongoing maintenance in hard water
Hard water is a real factor in Riverside County and San Bernardino County. The minerals it carries deposit as scale on a tankless unit’s heat exchanger, which reduces efficiency, can trigger error codes, and shortens the working life of the unit if left unaddressed. Descaling is the primary maintenance task for a tankless unit in a hard-water area. Fixr (2025) puts a maintenance visit at $45–$400 per visit (standard plumber rates).
For what homeowners can check themselves, what to leave to a plumber, and how hard water affects a tankless unit differently from a tank, see our water heater maintenance guide.
When tankless may or may not make sense
May make sense
- A larger household that runs out of hot water with the current tank. Tankless delivers continuous flow without a storage limit.
- A home where the gas infrastructure is already in reasonable shape. Gas line and venting prep is where most of the cost gap lives.
- A home you plan to stay in for a while
- A conversion where you want to reclaim the floor space a tank occupies
May not make sense
- A home being sold in the near term. The upfront cost difference may not be recovered in the sale price.
- A home where the gas line or electrical panel would require significant upgrade work, making the total cost substantially higher
- A situation where a straight tank replacement resolves the problem and the household does not run out of hot water
- A budget that does not accommodate the higher upfront cost. A tank replacement with 0% financing on approved credit may be the more practical path.
Biz-E-Bee Plumbing & Rooter (CSLB #1158584, B and C-36) quotes both options, tank replacement and tankless installation, after assessing the gas line, venting, and space on-site. That way the comparison is between two real numbers, not estimates.
Get an in-person quote across Riverside and San Bernardino County
Biz-E-Bee Plumbing & Rooter (CSLB #1158584, B and C-36) installs and services tank and tankless water heaters across Riverside County and San Bernardino County. We assess the gas line, venting, and space before quoting and offer 0% financing on approved credit for larger jobs.
Frequently asked questions
Thinking about going tankless?
A licensed plumber can look at your gas, venting, and space and give you an in-person quote. Call or book online.