No hot water? What each possible fix costs

Q: No hot water? What each possible fix costs

On an electric water heater the usual causes are a tripped breaker or blown fuse at $50 to $225, a thermostat at $75 to $250, or a heating element at $200 to $750. On a gas unit it is normally the pilot light or thermocouple, at $75 to $325. All figures from Fixr (August 2025). Work through them in that order, because the cheap causes are also the common ones.

Work through it in price order

The useful thing about this failure is that the cheap causes are also the common ones. Both columns below come from Fixr, August 2025.

Electric water heater

Cause	Repair	Replacement
Blown fuse or tripped breaker	$100 to $225	fuse $50 to $75
Thermostat	$75 to $150	$100 to $250
Heating element	not separately priced	$200 to $750

Gas water heater

Cause	Repair	Replacement
Pilot light out	$75 to $175	assembly $75 to $150
Thermocouple	part of the pilot repair	$150 to $325
Gas control valve	$75 to $150	$150 to $300

Fixr's overall repair figure for an electric water heater is $100 to $650 and for a gas one $150 to $750, with an average across all water heater repairs of $450.

Why the order matters

A technician who starts with the heating element on an electric unit is starting at the most expensive end. Fixr's repair price for a breaker or fuse fault is $50 to $225; for the element it is $200 to $750. The difference is roughly the price of the call-out plus a second one.

This Old House's maintenance guidance suggests the same order from the other direction: inconsistent water temperature points at a failing heating element or thermostat, which are the mid-priced causes, not the cheapest or the most expensive.

Before you call anyone, check two things that cost nothing. On an electric unit, look at the breaker panel. On a gas unit, look at whether the pilot is lit. Fixr notes a pilot light can go out for various reasons and that a full replacement of the assembly is rare; usually the thermocouple needs adjusting or the light needs relighting by a professional. Those are the two cases where a service call finds nothing wrong with the appliance at all.

Partly hot, not cold: a different fault

If there is hot water but it runs out far faster than it used to, the part to look at is not the element. It is the dip tube, at $100 to $250 replaced (Fixr).

The dip tube carries incoming cold water to the bottom of the tank so it does not mix with the hot water at the top. Fixr states the symptom directly: when dip tubes break, the hot water runs out very quickly. A broken one dumps cold water straight into the hot layer near the outlet.

This is worth knowing because the symptom reads like a tank that is too small, and the expensive response to that is a bigger water heater at $900 to $3,000.

Lukewarm everywhere: check the thermostat setting first

This Old House puts the recommended setting at 120 degrees Fahrenheit and notes that for every 10 degrees you lower the temperature you can expect to save up to 5% in energy costs. A unit set low, or knocked down by someone, produces exactly the "never quite hot enough" complaint.

The dial is on the side of the tank and adjusts with a flathead screwdriver. That is a five-minute check before a service call.

When a repair stops making sense

Fixr's rule: a repair is usually worthwhile if the unit has at least half its expected lifespan remaining and the repair costs under 50% of replacement. This Old House's version: replace when repair costs exceed half the replacement cost, or the unit is 10 or more years old.

Against Fixr's average replacement cost of $1,400, the 50% threshold is about $700. Every cause on this page falls below it except a heating element at the top of its range. What tips the decision is age, not the part. A $600 element replacement in a 4-year-old heater is worth doing; the same repair in an 11-year-old heater is money spent on an appliance that Fixr and This Old House both expect to fail within 8 to 12 years.

Our water heater age decoder reads the manufacturing date from the serial number, which is the input the rule actually needs. See also repair or replace.

What you should not do yourself

This Old House is specific: work involving gas lines, heating elements, or safety devices like the temperature and pressure relief valve is better left to a licensed professional, and the same applies to older units that have not been maintained regularly, because disturbing worn parts can create new problems.

Checking a breaker, looking at a pilot light and reading a thermostat dial are fine. Replacing an element on a live electric circuit, or working on a gas valve, is not.

Sources

Price figures are national US ranges from the sources above as of the date shown. Your local price depends on labor rates, permits and site conditions. Read how we get our numbers.