Reducing the time duration to fill a bathtub to 30 seconds for 250 liters is a challenging task, but there are a few options you can consider:
Increase the water flow rate: Check if your bathtub faucet has a flow rate adjustment feature. If it does, maximize the flow rate to achieve faster filling. Alternatively, you can consider installing a high-flow faucet or a dedicated water line with a higher flow rate specifically for filling the bathtub.
Install a larger water supply line: If the current water supply line to your bathtub is small, replacing it with a larger diameter line can increase the flow rate and fill the bathtub more quickly. However, this may require professional plumbing assistance.
Utilize multiple water sources: If your home has more than one water supply line, consider using multiple sources simultaneously to fill the bathtub. For example, if you have access to both hot and cold water lines, you can connect them to the bathtub simultaneously to increase the flow rate.
Modify the bathtub design: Consider replacing your current bathtub with a larger capacity tub. A larger tub will hold more water, allowing you to reach the desired level in a shorter time.
Preheat the water: If you typically fill the tub with hot water, consider preheating the water in advance. This can be done using a separate water heater or by increasing the temperature setting on your existing water heater, allowing you to fill the tub more quickly by using hot water directly.
Remember, some of these options may require professional assistance or modifications to your plumbing system, so it's essential to consult with a plumber or a professional to ensure safety and compliance with local building codes.