Tankless Water Heater Installation, Repair & Service in Northern Virginia & Maryland

Is a Tankless Water Heater Worth It?

For a lot of households, yes — but it isn’t the right answer for everyone. Here’s how it breaks down.

The pros:

• Endless hot water. Tankless units heat water as it flows, so the second, third, and fourth shower in a row is just as hot as the first.
• Longer lifespan. With annual maintenance, a tankless unit typically outlives a conventional tank by many years.
• Lower energy use. No standby heat loss — the unit isn’t burning fuel 24/7 to keep 50 gallons hot “just in case.”
• Space savings. A tankless unit hangs on the wall, freeing up a closet-sized footprint in basements and utility rooms.

The cons:

• Higher upfront cost. The unit itself plus conversion work (gas line, venting, electrical) costs more than swapping in a new tank.
• Conversion complexity. Retrofitting a tankless unit into a home built for a tank often means upgrading the gas line and installing new venting — we’ll assess this before you commit to anything.
• Hard-water maintenance. Water in parts of Northern Virginia and Maryland is moderately hard, and scale is the enemy of tankless heat exchangers. Plan on annual descaling.

Bottom line: if your tank is failing, your family keeps running out of hot water, or you’re planning to stay in your home long-term, going tankless usually pays off. If your tank is young and healthy, it’s rarely worth ripping out. A free written estimate will show which camp you’re in. Prefer to stay with a tank? See water heater installation and replacement.

Considering the switch? Get a free written estimate with your exact conversion scope — gas line, venting, and all. VA: 703-457-9028 · MD: 301-686-7129 · 0% APR up to 18 months on select units (Wells Fargo, subject to approval).

Converting From a Tank to Tankless

Converting from a tank water heater to tankless is the trickiest part of the job, and it’s where hiring a licensed, experienced installer matters most. Here’s what every conversion has to account for:

Gas line upgrade

Tankless units fire a much larger burner than a tank heater. Many homes — especially older ones across Fairfax County and Montgomery County — need a larger-diameter gas line run from the meter to the unit. The gas line has to be sized and installed to code.

Venting

Tankless units need dedicated venting to the outdoors (typically concentric or direct-vent pipe), routed very differently from a tank’s flue. The vent run has to fit your layout and meet manufacturer clearances.

Electrical

Gas tankless units still need electricity for the ignition, controls, and freeze protection. We’ll confirm you have a nearby outlet or add one.

Permits and inspection

Conversions require permits in most Northern Virginia and Maryland jurisdictions. Your written estimate shows the permit your job needs.

Because conversion scope varies so much house to house, a tankless conversion is quoted after seeing the home. Every conversion starts with a free on-site assessment and a written price before any work begins. VA license 2705039269A · MD license 520714137895.

Tankless Service & Descaling

A tankless water heater is only “maintenance-free” in the brochure. In real life, it needs annual service, especially where water is hard.

What tankless service includes

A tankless service visit is built around protecting the heat exchanger, the most expensive part of the unit:

• Descaling flush. A descaling solution is circulated through the heat exchanger to dissolve mineral buildup that chokes efficiency and can trigger error codes or shutdowns.
• Water and gas filter cleaning. Sediment screens and filters get cleaned so flow stays strong and ignition stays reliable.
• Burner and ignition check. Clean combustion and proper flame are verified, so the unit fires every time you turn on the tap.
• Temperature and venting check. The unit is checked for its set temperature rise, and venting and condensate drains are checked for blockages.
• Full system health check. Error codes, worn parts, and early warning signs — and you see what was found.

How often does a tankless water heater need descaling?

Once a year, minimum. Homes with harder water or high usage may need it more often. Skip it and scale builds up silently — cutting efficiency, stressing the heat exchanger, and cutting years off the unit’s life.

Signs your tankless unit needs service

• Fluctuating water temperature or a “cold water sandwich”
• Error codes on the display
• Rumbling or vibration during operation
• Longer wait for hot water than usual

If you’re seeing any of these, book a $90 visit. The technician diagnoses it and gives you a written price before any repair work starts — no overtime fees, even if it’s 9 PM on a Sunday.

Tankless Water Heater Cost

The question everyone asks: what does it actually cost? Tankless pricing varies because every installation is different — cost depends on:

• New install vs. conversion. A straight like-for-like replacement is the simplest job. Converting from a tank adds gas-line, venting, and electrical work — the estimate itemizes what your home needs.
• Unit sizing for your household. A unit sized for a two-bathroom townhome costs less than one feeding a five-bathroom home with a soaking tub and body sprays. Sizing is based on your actual hot water demand.
• Gas vs. electric. Gas tankless units are the usual choice for whole-home use; electric point-of-use units serve a different role. We’ll recommend what fits your panel and your goals.

What we can promise about cost:

• Free written estimates on every installation and conversion — you’ll see the full scope before you decide.
• Wells Fargo financing: 0% APR for up to 18 months on select units, with zero-down plans available. Subject to lender approval.
• Written price before work starts.

And if any rebates apply to your installation, ask us which rebates apply — programs change, and we’ll point you at what’s current rather than quoting outdated numbers.

Why Homeowners Choose AVS for Tankless Water Heater

• Family-owned since 1991: More than 30 years of HVAC service in Northern Virginia and Maryland.
• Seen on ABC7 News: Anil Sareen of AVS Heating and Air Conditioning was interviewed on ABC7 News.
• Licensed in Virginia and Maryland: Virginia HVAC 2705039269A · Maryland HVAC 520714137895 · Maryland Home Improvement 4192876.
• Three local offices: Fairfax, VA · Falls Church, VA · Bethesda, MD.
• 4.8★ on Google: 354 reviews across our three offices.