You turned on the shower, waited, and… still lukewarm. Cold, even. You checked the water heater. It’s running. So what’s going on?
Here’s the thing: a lack of hot water doesn’t always mean your water heater is broken. In fact, some of the most common causes have nothing to do with the heater itself. At Abend Services, we’ve seen this play out many times since our doors opened in 1952. And most homeowners are genuinely surprised by what’s actually causing the problem.
If you’re dealing with this right now and you’re not sure where to start, speaking with a plumbing company near you can help you get a clear answer fast, especially if there are gas or electrical components involved.
Let’s walk through what’s most likely happening.
This is one of the most common questions we hear. And it’s a fair one. If the unit is on, the water should be hot, right?
Not necessarily.
The heater itself might be working fine. The problem often lives somewhere else in the system, like a specific part inside the tank or a valve somewhere in your plumbing lines. These issues are sneakier, and they don’t always show obvious warning signs.
Here are the main culprits worth knowing about.
Yes, and it’s more common than most people expect.
Sediment is probably the sneakiest culprit we see, especially in homes with hard water. Multiple plumber reports from 2025 and 2026 consistently name it as the top cause of reduced hot water performance across the country.
Here’s why it happens:
This is especially relevant in Maryland. Water hardness across Anne Arundel County and surrounding areas typically falls between 60 and 180 PPM (roughly 3.5 to 10.5 grains per gallon). That’s in the moderately hard range, which is exactly the level where sediment builds up faster and shortens water heater life.
If your hot water has been gradually getting less hot over months, sediment is likely playing a role.
This one surprises a lot of people.
Inside your water heater, there’s a plastic tube called a dip tube. Its job is to push incoming cold water down to the bottom of the tank, where it gets heated before rising to the top as hot water.
When that tube cracks or breaks, cold water enters near the top of the tank instead. It mixes directly with your hot water before it ever leaves the heater. The result? Water that starts warm but goes lukewarm within a few minutes.
Watch for these signs:
A broken dip tube is a component issue, not a full heater failure. But it does require a licensed plumber to assess and replace properly.
Modern plumbing systems often include tempering valves or mixing valves designed to prevent scalding. These are typically installed near the water heater and blend hot and cold water to deliver water at a safer temperature.
When these valves fail or get stuck, they can dilute your hot water too much, giving you water that feels lukewarm even when the heater is working correctly.
Similarly, a cross-connection (where cold water leaks into hot water lines through a faulty single-handle faucet or failed check valve) produces the same result. Cold water bleeds into your hot lines, and the water at your tap never reaches the right temperature.
This is actually a regulated issue. Maryland has adopted the 2024 International Plumbing Code (effective November 2025 and enforced through 2026), which includes strict guidelines around cross-connection prevention. Any repair or replacement has to meet these standards, which is another reason to work with a licensed professional rather than attempt a fix independently.
Sometimes the fix is simple, and this one’s worth checking early.
For electric water heaters:
For gas water heaters:
A technician from AAA STL shared a story in May 2025 that’s worth repeating here. He described a family that went three days without hot water, convinced their heater had failed. The actual cause? Their cat had bumped the gas valve from “on” to “pilot.” A 30-second fix solved everything.
It sounds funny in hindsight, but it’s a real reminder that the simplest causes are sometimes the ones we overlook longest.
Electric water heaters typically have two heating elements, one near the top of the tank and one near the bottom. Each has its own thermostat.
If one element burns out or a thermostat fails, the heater won’t regulate temperature properly. You might get some hot water, but not enough, or water that reaches a certain point and won’t go higher.
Signs this might be the issue:
This is a repair that involves electrical components and should always be handled by a licensed plumber or technician.
Even if there’s no single obvious cause, age alone is worth considering.
Here’s what the data shows:
If your heater is past the 10-year mark and you’re noticing performance issues, it may be approaching the end of its reliable service life.
If your water heater does need to be replaced, this is worth knowing now rather than later.
Starting October 6, 2026, the U.S. Department of Energy’s updated commercial water heater standards take effect. Non-condensing gas water heaters will be phased out in favor of high-efficiency condensing models. This also affects high-input residential gas units (over 75,000 BTU/hr).
For electric water heaters (effective May 6, 2029), tanks over 35 gallons will need to use heat pump technology to meet updated efficiency requirements. Standard resistance-element models won’t be compliant for new installations.
What this means for homeowners: when the time comes to replace your unit, the options available will shift toward higher-efficiency models. A licensed plumber familiar with current code requirements is the right person to help you make the right choice for your home and ensure the installation meets Maryland’s updated plumbing standards.
If you’re already dealing with an older unit and performance issues, this is a good time to speak with a licensed plumber about plumbing repairs, replacements, and installations before the situation becomes urgent.
| Cause | What Happens | Who to Call |
| Sediment buildup | Reduced heating, lukewarm water | Licensed plumber |
| Broken dip tube | Rapid temperature drop, lukewarm after short use | Licensed plumber |
| Failed mixing or tempering valve | Diluted hot water at tap | Licensed plumber |
| Cross-connection in plumbing lines | Cold water bleeding into hot supply | Licensed plumber |
| Tripped breaker / gas valve issue | No hot water at all | Licensed plumber or technician |
| Faulty thermostat or element | Water partially heats, won’t reach full temp | Licensed plumber |
| Water heater near or past end of life | Declining performance over time | Licensed plumber |
At Abend Services, we’ve been working in Maryland homes since 1952, serving families across Annapolis, Arnold, Brooklyn Park, Crofton, Glen Burnie, Millersville, Odenton, Parole, Pasadena, and Severna Park.
What we notice in this region specifically is that hard water plays a significant role in the problems homeowners deal with. The mineral content in Maryland’s water supply speeds up sediment buildup and puts more wear on water heater components than homeowners typically expect. A water heater that might last 12 years somewhere else might start showing issues earlier here if it hasn’t been properly maintained.
We’re a woman-owned, family-run business, and our team treats every call the same way we’d want our own home handled. Safety first, always. No shortcuts.
Don’t guess when it comes to gas lines, electrical components, or code-regulated plumbing systems.
The safest next step is to call a licensed plumber who can properly diagnose the issue, tell you whether repair or replacement makes more sense given the age of your unit, and ensure any work done meets Maryland’s current plumbing code requirements.
Abend Services offers 24/7 emergency service for situations that can’t wait. Whether it’s a component repair, a full replacement, or something in the lines you haven’t been able to pinpoint, we’re here to help get your hot water back where it belongs.
Why is my water not getting hot even though the heater is on? Several things can cause this without the heater itself failing. The most common include sediment buildup inside the tank, a broken dip tube, a failed mixing valve, or a cross-connection in your plumbing lines. A licensed plumber can identify the specific cause with a proper assessment.
Why does my hot water only last a few minutes before going lukewarm? A broken or cracked dip tube is a common cause of this. When the tube fails, cold water enters near the top of the tank and mixes with hot water before it reaches your tap. This shortens how long hot water lasts noticeably.
Is lukewarm water a sign my water heater needs to be replaced? Not necessarily. Lukewarm water is often caused by a repairable issue like sediment buildup, a failed heating element, or a valve problem. A plumber can assess whether repair or replacement makes more sense based on the age and condition of your unit.
How does Maryland’s hard water affect my water heater? Maryland’s water hardness typically ranges from 60 to 180 PPM. At that level, minerals like calcium and magnesium settle inside the tank over time, creating buildup that reduces heating efficiency and can shorten the lifespan of your unit.
What’s the lifespan of a typical water heater? Tank water heaters generally last 8 to 12 years. Tankless models can last 20 years or more with proper maintenance. If your unit is over 10 years old and showing performance issues, it’s worth having it assessed.
Are there new rules about water heater replacements? Yes. Starting October 6, 2026, new DOE standards require higher-efficiency models for gas water heaters. For electric tanks over 35 gallons, heat pump technology will be required for new installations starting May 6, 2029. A licensed plumber can help you understand what these changes mean when it’s time to replace your unit.
Should I try to fix a water heater issue myself? Gas lines, electrical components, and code-regulated plumbing systems carry real safety risks. Repairs and replacements should be handled by a licensed plumber to ensure safety and compliance with Maryland’s current plumbing code.
Does Abend Services offer emergency plumbing services? Yes. Abend Services provides 24/7 emergency service across Annapolis, Arnold, Brooklyn Park, Crofton, Glen Burnie, Millersville, Odenton, Parole, Pasadena, and Severna Park.
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