Tankless Water Heaters in Manassas & Northern Virginia

Tankless Water Heater Services in Manassas & Northern Virginia

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Wall-mounted tankless water heater

A tankless system is not a one-size-fits-all upgrade. Proper sizing and installation matter just as much as the equipment itself. Also, many homes in the Manassas area were originally built for standard tank water heaters. Switching to tankless can require electrical, gas, or venting upgrades. Our technicians are familiar with local home layouts and explain what’s needed before work begins.

At Parrish Services, we provide expert tankless water heater installations in Manassas, installing both gas and electric tankless water heaters based on your home’s setup and usage needs.

Our technicians consider:

  • How many bathrooms you have
  • How often multiple fixtures run at once
  • Gas line or electrical capacity
  • Venting and clearance requirements

Tankless water heaters offer longer system life, improved energy efficiency, and continuous hot water, but only when installed correctly. We make sure your system is sized properly and meets all safety and manufacturer requirements.

If your current tank water heater is nearing the end of its lifespan, we can evaluate whether replacement with an on-demand water heater in Northern Virginia makes sense for your household.

Tankless Water Heater Repair



Tankless water heaters need regular maintenance to keep working properly. In Northern Virginia, minerals in the water supply can build up inside the unit and block normal water flow.

Over time, this buildup makes the heater work harder to warm water. A professional flush clears out those deposits, helping the system heat evenly and avoid unnecessary strain. Without maintenance, hot water output can drop, and parts can wear out faster.

Routine maintenance helps your system:

  • Heat water more consistently
  • Use less energy
  • Avoid surprise breakdowns
  • Last closer to its full expected lifespan
Tankless Water Heaters

Schedule Tankless Water Heater Services Today


Can I replace a tank water heater with a tankless one?

Yes. Many homes can switch to a tankless system. Some homes may need gas, electrical, or venting updates, which our technicians can review during an in-home visit.

What kind of maintenance does a tankless water heater need?

Tankless water heaters need regular flushing to remove mineral buildup. This helps the system heat water properly and avoid wear on internal parts.

When should I replace my tankless water heater?

Tankless water heaters typically last between 15 and 20 years, so it’s time to start planning for a replacement when yours approaches this age. Other reasons to replace include inconsistent hot water, significant declines in energy efficiency, and if your unit requires frequent or costly repairs,


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Customer Reviews

Parrish has the best customers in Northern Virginia, hands down! To learn more about the Parrish Difference or discover the many reasons that so many new customers are now lifetime customers, check out these stories from verified clients.

Alton our technician was awesome. Extremely professional, courteous, and knowledgeable. I appreciated him taking on all my questions and able to answer them so thoroughly without ever feeling rushed. Definitely will be requesting him on all our electrical home needs going forward.
Chris Gabriel
Chris Gabriel
00:22 13 Feb 25
I had a great experience with Parrish, and the head technician, Danny Shoop (the assistant was also very good). We had a number of plumbing issues that needed repair, and the work was completed to our satisfaction. I was impressed by Danny's professionalism, his work ethic, and the suggestions and recommendations he made. I will definitely use Parrish again.
Trina Santry
Trina Santry
19:35 07 Feb 25
I wanted to express my sincere appreciation for Nathan Wilkinson for the exceptional service provided during the recent gas inspection. Your expertise and professionalism were evident from the start. You arrived promptly at the scheduled time, demonstrating a strong commitment to punctuality. You conducted a thorough and meticulous inspection of the gas systems, ensuring every detail was carefully examined. Your knowledge and attention to safety measures were remarkable. Thank you
Rita Domit
Rita Domit
14:09 28 Jan 25
I woke up at 6:30 with my smoke detector going off. Changes batteries but that didn't work. Web said they might be end of life, so I turned to m electrician. Parrish was wonderful! She was patient with me and went out of her way to help get it add today. Alton was the tech who was also helpful, patient, and informative. He came out and fixed the problem. He was professional and made me feel listened to. Cost was reasonable. Highly recommend this company.
Wendy Martinez
Wendy Martinez
22:52 22 Jan 25
Andre and the other technician did a great job installing the new furnace hot water heater and air conditioner. I appreciated the prep and care taken in my home as they carried out the old and brought in the new furnace and hot water heater. Andre took the time to answer what overall questions I had and kept me up to date on the installation progress.
Cynthia Venne
Cynthia Venne
14:07 20 Jan 25
Brandon did a routine inspection of our HVAC that we knew was reaching its replacement age. He was very professional and honest with his assessment and what needed to be repaired or replaced and why, complete with photos and diagnostics. He made sure I knew all my options and pricing (including cost savings) for the recommended parts and services. Very happy with Brandon’s service and Parrish in general.
Brett Gillies
Brett Gillies
14:43 17 Jan 25
Clarence Boyd fixed the toilet tank leak. He diagnosed the issue so quick and resolved it in less than 30 min. He is courteous, knowledgeable and efficient. I highly recommend him.
Rita Domit
Rita Domit
14:14 15 Jan 25
Alton conducted a comprehensive inspection of our home's electrical system. He explained issues as he found them, and even made water heater and fire safety recommendations. I was pleased with his ability to communicate issues clearly and provide a quick turnaround for the quotes.
nihad khdair
nihad khdair
01:02 15 Jan 25
My wife, Janice, worked with Alton Wallace to convert our fireplace from gas to electric, and Alton was wonderful! We’d never tackled a project like this before so we had some questions along the way, but Alton was very patient and willing to walk us through step-by-step. He was personable and very knowledgeable. We would definitely recommend Alton to future clients!
Douglas Gore
Douglas Gore
21:36 13 Jan 25
I am very pleased with the excellent service I received today from Nathan W. with Parrish services. He diagnosed the issue quickly and got my heat back on! He answered all my questions and was polite and courteous! Parrish has been our Heating/AC maintenance company for many years and always gives great service!
Anne Leeson
Anne Leeson
20:01 10 Jan 25