1. Impact on steam temperature: Generally when steam pressure rises, the superheated steam temperature will rise too. This is because when the steam pressure rises, the saturation temperature rises accordingly, then more heat is consumed for water to become steam. In the case of constant fuel, the evaporation capacity of the boiler will instantly decrease, namely the steam through the superheater is reduced, and relatively the heat absorption capacity of steam is increased, thus causing the superheated steam temperature to rise. 

2. Impact on Water Level: When the steam pressure reduces, due to the reduction of saturation temperature, part of the boiler water evaporates, so the water level will rise. Conversely when steam pressure increases, due to the rise of saturation temperature, part of the steam of boiler water condenses, causing boiler water volume to shrink, so the water level will decrease. If the steam pressure change is caused by the load, then the water level change above mentioned is a temporary phenomenon, and then it will change in the opposite direction.