Luis 1-15-26 return visit to check hot water issue. After troubleshooting and talking to Joe while onsite. Found that when tub is open at fullest GPM decreases. I time the tub water delivery it takes 1 minute to fill 5 gallon bucket, when hot water valve is full 100%. Water Temp decreases to around 107 F. I told Maria to set valve half way to give time for boiler to catch up with the water demand. At half way water was consistent at 118F. Hot tub takes about 45/50 gallons depending on customer demand. Maria will try This procedure tonight. I called Joe at the end of the call.