Tankless Water Heaters

Whole-house tankless system sizing is a technical step that determines whether a tankless installation will satisfy the household’s hot water demand or fall short during peak use. DC Electrical HVAC Plumbing performs proper sizing calculations on every whole-house tankless installation in Lawrence, KS rather than defaulting to a standard unit size that may not match the specific household. The sizing process begins with identifying the peak simultaneous demand scenario for the household, which means determining how many hot water fixtures are likely to run at the same time during the busiest period of the day. A household that runs two showers simultaneously while the dishwasher cycles has a higher peak simultaneous demand than one that uses fixtures sequentially. Each fixture type has an average flow rate that contributes to the total simultaneous demand, and the sum of those flow rates at the peak scenario is the minimum flow rate the tankless unit must supply at the required output temperature. The temperature rise required from the incoming cold water temperature to the desired output temperature affects the unit’s capacity significantly; a unit rated at a given flow rate at a forty-five degree temperature rise will deliver less flow at a sixty degree temperature rise. Lawrence, KS winter groundwater temperatures require a larger temperature rise than summer temperatures, meaning a unit that performs adequately in summer may fall short in winter if it was not sized correctly for the winter incoming water temperature. We use the winter incoming water temperature as the basis for sizing to ensure the unit performs correctly year-round.

Tankless water heater descaling and maintenance service is a critical component of long-term performance for gas and electric tankless units installed in areas with hard water, which applies to much of the Lawrence, KS area served by municipal water supplies. Scale accumulates on the interior walls of the heat exchanger as mineral-laden water is heated and the minerals precipitate out of solution onto the hot metal surfaces. A heat exchanger with scale buildup transfers heat less efficiently than a clean one, requiring the unit to work harder and longer to achieve the same output temperature. As scale accumulates, the unit begins generating error codes, the output temperature becomes inconsistent, and the flow rate at the set temperature decreases noticeably. DC Electrical HVAC Plumbing performs tankless water heater descaling throughout Lawrence, KS by circulating a food-grade descaling solution through the heat exchanger using a flushing kit that connects to the service valves installed at the unit during the original installation. The descaling solution dissolves the mineral scale from the heat exchanger interior and restores heat transfer efficiency. Annual descaling is recommended for units in hard water areas and for units installed without an upstream water softener. We also clean the inlet filter screen during every maintenance visit, since a clogged inlet filter reduces flow to the unit and causes the flow sensor to fail to detect adequate demand, resulting in intermittent activation or no activation at the expected flow rates.

Tankless water heater replacement addresses situations where an existing tankless unit has reached the end of its service life, experienced a failure that is not cost-effective to repair, or is being replaced with a higher-capacity unit to meet increased household demand. DC Electrical HVAC Plumbing performs tankless water heater replacements throughout Lawrence, KS, assessing the existing installation before recommending a replacement unit to confirm that the existing gas supply, venting configuration, and water connections are adequate for the new unit or identifying modifications required as part of the replacement. Replacing a tankless unit with the same model is straightforward when the existing installation is in sound condition; the water connections, gas line or electrical connections, and venting are reused and the new unit is mounted in the same location. Replacing with a higher-capacity unit may require upgrading the gas supply line, modifying the venting to accommodate the higher exhaust volume, or adding electrical capacity for a larger electric unit. We assess these requirements during the estimate visit and include any necessary modifications in the project scope so there are no surprises when the replacement work begins. Every tankless replacement is tested through a full demand cycle before we consider the installation complete.

Commercial tankless water heater installation addresses the hot water demands of restaurants, office buildings, multi-unit residential properties, and other commercial facilities that benefit from the efficiency and space savings of tankless technology. DC Electrical HVAC Plumbing installs commercial-grade tankless water heaters and multi-unit tankless systems throughout Lawrence, KS for commercial properties that need higher flow rates and more durable equipment than residential units provide. Commercial tankless systems may involve multiple units installed in parallel or in series to achieve the combined flow rate required for a high-demand application like a restaurant or a multi-unit residential building with simultaneous morning shower demand. Cascading tankless systems use multiple units connected to a manifold with a controller that activates additional units as demand increases, providing a scalable system that matches output to actual demand rather than running at full capacity continuously. We design commercial tankless systems based on the peak simultaneous demand of the facility and the fuel type and electrical capacity available at the installation location. Commercial installations are permitted and inspected where required and documented for the property record. DC Electrical HVAC Plumbing brings the same honest, thorough approach to commercial tankless installations that Lawrence, KS homeowners expect from our residential work.

Tankless water heater installation for additions and renovations addresses the hot water demand of new living spaces, in-law suites, garage apartments, and home additions that are either connected to the main hot water system or served by a dedicated point-of-use unit. DC Electrical HVAC Plumbing assesses the existing tankless or tank water heater capacity during addition and renovation projects to determine whether the current system can support the added hot water demand or whether a supplemental unit is needed. A large addition with a full bathroom, kitchen, and laundry connection may exceed the remaining capacity of the existing water heater system, particularly if the existing unit was already sized at the limit of the original home’s demand. Installing a supplemental tankless unit in the addition area, connected to the same water supply but operating independently of the main water heater, is a common approach that provides dedicated capacity for the addition without requiring the main water heater to cover the increased demand. Point-of-use tankless units installed under a sink or in a cabinet near a single fixture provide immediate hot water to that location without waiting for hot water to travel from the main water heater through a long supply run. Every addition and renovation tankless installation is coordinated with the overall project schedule and permitted as required by the local authority.