Possibly, but only if the heater is sized for the home's simultaneous hot-water flow and the local incoming-water temperature. A tankless unit has a maximum gallons-per-minute capacity at a particular temperature rise; it cannot supply unlimited flow. Large households may need a higher-capacity or multiple-unit setup after a professional load calculation.
Get a real answer from VIP PlumbingOk.
Explain what you're seeing; our team can arrange an onsite assessment.
Keep learning
For more context about this type of plumbing issue, read our related Oklahoma City guide.
Read the related VIP plumbing guide