Sizing and Venting Matter More Than You Think

Adams Tankless Water Heater Service & Repair handles the full installation process for residential and light commercial tankless water heaters, from calculating the correct unit size based on simultaneous fixture usage to testing the completed system under normal demand. You may be replacing a storage tank that takes up too much space, or adding hot water capacity during a bathroom addition where running a dedicated line from the existing heater is not practical. The installer evaluates your household's peak hot water draw by counting the number of showers, faucets, and appliances that could run at the same time, then selects a unit with adequate flow rate measured in gallons per minute.



Gas line capacity is verified before installation begins. The existing line is checked for diameter and length to ensure it can deliver the BTU input required by the tankless unit, which is significantly higher than a storage water heater. If the line is undersized, it must be upgraded to prevent low pressure that causes ignition failure or incomplete combustion. Venting is installed according to manufacturer specifications and local code, with proper slope to allow condensation drainage and clearance from windows, air intakes, and combustible materials. The old equipment is disconnected, drained, and removed from the property.

If you are considering a switch to tankless or need a unit installed during construction, reach out to Adams Tankless Water Heater Service & Repair to schedule a site assessment in Collinsville.

Hot water arrives at the tap within seconds of opening the valve, and the temperature remains steady regardless of how long the shower runs. You no longer wait for a tank to refill after multiple back-to-back showers. The unit mounts on the wall and frees up floor space previously occupied by a 40 or 50 gallon tank. Monthly energy costs typically decrease because the burner only fires when hot water is called for, rather than maintaining a reservoir at temperature around the clock.



Adams Tankless Water Heater Service & Repair tests the system before leaving by running multiple fixtures simultaneously to confirm the unit meets demand without temperature drop. Gas connections are leak-checked using soap solution and a manometer. The exhaust vent is inspected during operation to ensure proper draft and no spillage. You receive guidance on descaling intervals and basic maintenance tasks that help extend the lifespan of the heat exchanger.

Installation includes code-compliant venting, secure gas connections, and proper electrical supply for the ignition and control board. Water shutoff valves are installed on both the inlet and outlet to allow future descaling without draining the entire plumbing system. The unit is set to the desired outlet temperature and tested across a range of flow rates to verify consistent heating.