Check what failed before you replace the heater. Find out how Loudoun handles gas upgrades. Settle what the price covers before you sign.
Establish what actually failed
Ask the plumber to name the fault the replacement will fix. Where is water escaping? What stopped heating? Why are you running short of hot water? Note whether every hot tap has the same problem. Check whether cold water also looks or smells different. Write down what changed before the trouble began. These details tell the plumber more than the tank’s age alone.
If you use Loudoun Water, its guidance says to check the source of trouble before buying equipment. Particles can come from the heater or other plumbing parts, as the county plumbing overview explains. Ask what the plumber found: a failed part, mineral deposits, or a reason to replace the whole unit. Get that finding in the quote.
If pipes knock as well, ask the plumber to check your household pressure. Loudoun Water says a separate pressure-reducing valve limits pressure and strain on pipes. A new heater does not prove that valve works. The utility’s guidance applies to its customers. It cannot tell you the condition of a private well.
Source: Loudoun Water, Drinking Water Quality FAQs and Protect Your Pipes, undated guidance; no effective dates stated. Questions to ask are editorial guidance. Gathered 2026-09-23.
Choose equipment that fits the household and the room
Before you accept “same size,” compare the proposed model with your old heater. For a storage heater, ask for its first-hour rating. Check its tank capacity too. The Department of Energy defines the rating as the hot water a fully heated unit can supply in the first hour. Tell the installer which showers and appliances you run together. Ask them to explain why the model suits that use.
A heat-pump water heater needs a suitable room. DOE says it draws heat from the surrounding air. This cools the space. It needs enough airflow. You also need room to service it. Ask the installer to check the model’s instructions against your cupboard or basement. Include access to the air filter in that check.
Ask for the quote to show where condensate will drain. Check whether you need a pump. DOE flags condensate leaks and blocked drains as problems to address when fitting this equipment. If you need new wiring, ask the contractor to spell out the work before you order. Settle which permits that work needs before you order too. Virginia’s permit rule covers changes to electrical wiring. The county overview describes uncertainty about permits for electric replacements. That does not settle whether you need a permit when the circuit changes.
Source: U.S. Department of Energy, Heating and Cooling Products: Water-Heating Equipment table, first-hour-rating definition, undated live guidance, no effective date stated; DOE Building America, Measure Guideline: Heat Pump Water Heaters in New and Existing Homes, February 2012, technical guidance rather than a code effective date; Virginia DHCD, 13VAC5-63-80, effective 2024-01-18. Gathered 2026-09-23.
A gas upgrade can reach beyond the heater
Under Loudoun’s gas-review rule, covered replacements can avoid plans review if they meet both conditions. The appliance must stay in place. Its BTU input must not increase. The county overview explains this distinction. Compare the old and proposed equipment labels before you sign. If a tankless model has higher input, ask how it affects the gas system before the installer promises a start date.
Loudoun’s gas-plan checklist asks for pipe sizes, materials, lengths, gas pressure, and appliance loads. Without a manifold, you need to give the BTU input of every appliance. You also need every branch size. The proposed heater’s label alone cannot give you those details.
For a manifold system, the county asks for the length from the meter regulator to the manifold regulator. It also needs the length from the manifold to each appliance. Include existing appliance loads. For propane tanks and outside lines, it also asks about the tank, regulators, piping, and gas load.
Ask who will record these details. Check whether the price covers any pipe or regulator work the design needs. This is why an upgrade may involve more than swapping the tanks.
Source: Loudoun County Building and Development, Residential Fuel Gas Permit Notice, effective 2025-10-01; Plans Submittal Criteria for Residential Gas Permits, undated checklist linked from that notice, no separate effective date stated. Gathered 2026-09-23.
Resolve the vent and leak protection before work starts
The county overview explains Virginia’s vent and drain-pan rules. Get the tasks for your replacement written into the agreement. Who checks the existing vent? Who supplies any required certification? Who pays if the vent needs repair?
Virginia requires a check of the connected vent or chimney when fuel-burning equipment is replaced. It must be the right size. It must be clear of obstructions. It must work without defects or deterioration. If the local building department does not inspect it, the installer must certify to the building official that it complies. Reusing the old route still requires that check.
Is your tank above finished space or beside materials that leaking water could damage? Ask the installer to explain the pan. Find out where collected water will go. Virginia requires a pan where tank leakage would cause damage. It prohibits a plastic pan beneath a gas-fired heater. Ask for the proposed material in the quote. Get any work needed around the heater listed too. Settle these details before the old tank leaves so you can compare what each quote covers.
Source: Virginia DHCD, 13VAC5-63-210, residential amendments M1801.1.1, G2425.1.1 and P2801.6, effective 2024-01-18. Contract questions are editorial guidance. Gathered 2026-09-23.
Compare the complete price and define when the job is finished
We could not verify a primary-source price range for water heater replacement fitted in Loudoun County. The county fees linked from the plumbing overview cover government charges. They do not price the heater, labour, disposal, or changes inside your house.
To compare written quotes, ask for these details:
- The exact model, fuel, capacity, and any promised hot-water performance.
- Who disconnects the old heater. Who removes it. Who carries in the new equipment. Who protects the route through your house.
- Which pipes, wiring, vents, drains, and nearby parts the installer will reuse or replace.
- Who handles permits. Who attends inspections. Who corrects rejected work. Who gives you the final result.
- What the equipment warranty covers. What the contractor covers. Which charges need your approval if the work changes.
You can get Loudoun’s inspection results through LandMARC. For a permitted job, ask for that record. Get the equipment manual too. Ask for the warranty paperwork. Have the installer show you the controls on your model. Ask them to show you its shutoffs. Get them to explain its maintenance tasks. Agree in writing whether the price includes a return visit to fix defects found at inspection. Hot water alone does not settle who is responsible.
Source: Loudoun County Building and Development, Fee Schedules and Payment Options and Building Inspections, undated live guidance, no effective dates stated. No primary-source county installed-price dataset was verified; quote and handover checklist is editorial guidance. Gathered 2026-09-23.