Water Heater Repair in Longmont, CO
Cold shower this morning? Water on the floor by the tank? M&M diagnoses and repairs tank and tankless water heaters around the clock, with no extra charge for nights or weekends.
Hot Water Back, Usually the Same Day
A water heater rarely fails at a convenient time. It is the first cold shower on a January morning in Longmont, or the puddle you spot in the utility room on the way to bed. The good news is that most water heater problems have a specific, fixable cause, and a licensed plumber can usually pin it down in one visit.
M&M Heating, Cooling, Plumbing & Electrical repairs gas and electric tank water heaters and tankless units of all makes and models. Our technicians arrive with the parts and diagnostic tools to handle the common failures on the spot: thermocouples and igniters, heating elements and thermostats, gas valves, pressure relief valves, drain valves, dip tubes and flow sensors. If sediment from our hard Front Range water is the culprit, a thorough flush often restores performance without replacing anything.
We are open 24/7, and we do not charge extra for nights, weekends or holidays. You get upfront pricing before any work starts, so there is no guessing at the bill. And if the honest answer is that your heater is near the end of its life, we will tell you plainly and walk you through your options on our water heater replacement page. Our goal is simply to get your hot water back the smart way.
Common Water Heater Problems in Longmont
Match what you are seeing to the list below. Most of these can be repaired the same day.
No Hot Water at All
On a gas unit, the pilot or igniter, thermocouple or gas valve is the usual suspect. On electric, it is often a tripped high-limit switch or a burned-out element. On tankless, check for an error code and call us with it.
Lukewarm or Runs Out Fast
A failed lower element, a broken dip tube that mixes cold water at the top of the tank, or a thick layer of sediment eating up capacity will all leave you with half the hot water you used to have.
Leaking Water Heater
Water at the base can come from a loose fitting, a dripping relief valve, a failed drain valve or a corroded tank. The first three are repairable. A leaking tank itself is not, and it needs attention right away.
Popping, Rumbling or Banging
Those sounds are water boiling beneath a crust of hard water sediment on the tank bottom. A professional flush usually quiets it. Left alone, the overheating shortens tank life.
Pilot Will Not Stay Lit
A pilot that keeps going out typically means a worn thermocouple, a dirty pilot assembly or a problem with the gas supply or venting. Do not keep relighting it. Let us find the cause.
Rusty Water or Rotten-Egg Smell
Brown hot water points to a spent anode rod or corrosion inside the tank. A sulfur smell usually means bacteria reacting with the anode. Replacing the rod often solves both if the tank is still sound.
The M&M Difference
Water heater repair from a Longmont family business that answers the phone at 2 a.m.
Truly 24/7, No After-Hours Markup
Hot water emergencies do not wait for business hours, so neither do we. Nights, weekends and holidays are priced the same as a Tuesday afternoon.
Diagnose First, Then Quote
We find the actual cause before talking money. You get a clear, upfront price for the repair and a straight answer if replacement would be the smarter spend.
All Makes, Tank & Tankless
Gas, electric, power-vent, tankless: our licensed technicians work on all of them and carry common parts so most repairs are completed in one visit.
Guaranteed Satisfaction
Family-owned since 1996 and backed by a 100% satisfaction guarantee. If something is not right after our visit, call and we will make it right.
Our 4-Step Process
Simple, transparent and built to get your hot water back fast.
Call & Describe the Problem
Tell us what you are seeing, and the brand and type of heater if you know it. For leaks, we will walk you through shutting off the water and gas or power until we arrive.
Inspect & Diagnose
Our technician tests the burner or elements, thermostats, valves, venting and connections, and checks for sediment and corrosion to identify the true cause, not just the symptom.
Approve the Upfront Price
You get a clear repair quote before any work begins. If the unit is at the end of its life, we show you both the repair cost and what replacement would look like.
Repair & Verify
We complete the repair with quality parts, relight or restart the unit, check for leaks, confirm safe operation of the relief valve and venting, and verify hot water at the tap.
Water Heater Repair Questions, Answered
My water heater is leaking. What should I do right now?
Turn off the cold water supply valve on top of the heater, then shut off the gas valve or flip the electrical breaker. If water is pooling, move anything nearby and put down towels. Then call us. Leaks from fittings and valves are often repairable, but a leak from the tank itself means the heater needs to be replaced, and we can help you with that quickly.
Why is my temperature and pressure relief valve dripping?
The T&P valve opens to release excess pressure or heat, so a drip means either the valve is worn or the system is building too much pressure. On closed plumbing systems, thermal expansion with no expansion tank is a common cause. Never plug or cap the valve. We test it, replace it if needed, and address the pressure problem so it does not come back.
Should I repair or replace my water heater?
If the heater is under about 8 to 10 years old and the problem is a single component such as an element, thermocouple, valve or anode rod, repair is usually the right call. If the tank is leaking, repairs are becoming frequent, or the unit is well past its typical lifespan, replacement often makes more sense. We give you honest pricing for both so you can decide.
Do you repair tankless water heaters too?
Yes. We service tankless units from all major manufacturers. Common tankless repairs include ignition and flame sensor problems, flow sensor failures, error codes caused by scale on the heat exchanger, and venting or condensate issues. Hard water is the main reason tankless units act up on the Front Range, and a professional descaling often restores full performance.
How fast can you get here?
We are open 24/7 and dispatch for water heater emergencies around the clock, with no extra charge for nights or weekends. Same-day service is available in most cases across Longmont and the surrounding Front Range communities. When you call, we will give you a realistic arrival window rather than a promise we cannot keep.
Why does my hot water smell like rotten eggs?
That sulfur smell usually comes from harmless bacteria in the tank reacting with the magnesium anode rod, which is more common in homes on well water or after the heater has sat unused. Flushing and sanitizing the tank and switching to a different anode type typically clears it up. If the smell is in cold water too, the source is the supply, not the heater.
Need Water Heater Repair in Longmont?
Open 24/7 | Emergency Service Available
Call (720) 608-3973Water Heater Repair Across the Front Range
Proudly serving Longmont, CO and surrounding communities.
Primary Service Area
- Longmont, CO
- Erie, CO
- Frederick, CO
- Firestone, CO
- Dacono, CO
Extended Area
- Mead, CO
- Johnstown, CO
- Berthoud, CO
- Niwot, CO
- Gunbarrel, CO
Also Serving
- Lafayette, CO
- Louisville, CO
- Superior, CO
