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There must be 100 posts on here about the Girard Tankless Water Heater and recommendations on how to use them properly. The "search" function can be your friend.
Here are the primary issues causing hot water problem in order of most common occurence.
50% of the time the issue is related not enough water flow do to poor water pressure. You need at least 45PSI of water pressure coming into the tank.
30% of the time the issue is people mixing cold water with the hot like they do at home and not setting the thermostat to the desired temperature and then only opening the hot valve for water.
10% of the time the issue is related to construction debris in the water line cause the strainers (screens on the faucets and shower) to become blocked and restrict the flow. There is also a strainer / screen at the water inlet to the back of the unit. This can also become blocked with debris. Thor does recommend removing this strainer in cases where people are having flow issues. The house water system filter is before the tankless so assuming there is no construction debris in the water line coming into the tankless, the strainer should not be be needed.
5% of the time the incoming water flow valve on the back of the unit needs adjusted. When the incoming water temp is very cold, then slowing the flow will allow the water to spend more time in the heat exchanger to heat up enough.
5% of the time it could be one of several other issues such as.... there is an actual problem with the tankless unit.... there is a bad faucet cartridge and it is allowing cold water to leak and mix in with the hot water.... there is a kink or some other blockage in the plumbing restricting flow.
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