When it comes to connecting a gas heater to an existing water supply line, there are certain considerations that must be taken into account. It is possible to do this yourself, but it is highly recommended that you seek the help of a technician to ensure that the size of the gas line meets local gas pipeline standards and codes. This is especially important when installing a tankless water heater, as it requires special considerations that do not apply to traditional water heaters with electrical resistance. For a tankless water heater to work properly, there must be a sufficient volume of air available to circulate through the unit.
A small closet (especially if the door does not have a design with blinds) would not be suitable as a location for an HPWH. The manufacturer typically recommends 750 ft3 of air. If you are looking to save some money and take on this project yourself, replacing a gas water heater isn't too difficult. To do this, you will need to set the lower gas regulator dial to the Pilot Lighting position and then turn the gas regulator control knob to PILOT mode.
Additionally, you will need to make sure that the size of the gas line meets the needs of your tankless water heater. When replacing tank-type gas water heaters, connections must be made to both the gas pipes and the flue gas vent. A small gas line can cause negative pressure in the gas line, resulting in the tankless water heater operating at a lower gas pressure. Tankless water heaters are becoming increasingly popular due to their ability to provide hot water quickly, but they require more gas than regular water heaters. If your gas line is too small, you may experience premature tankless water heater breakdowns, gas shortages, and corrosion in gas lines. To avoid these issues, it is recommended that your gas line measures between ¾ of an inch and ½ inch.
Additionally, we suggest using a larger gas line not only to maintain gas pressure but also to ensure a good volume of the gas line.
