Per Mertesacker often looks grim because he is known for his intense focus and concentration on the field. As a professional footballer, he takes his job very seriously and is known for his no-nonsense approach to the game. Additionally, his tall and imposing stature may also contribute to his serious appearance. Off the field, Mertesacker is known to have a more lighthearted and humorous personality. **

Per Mertesacker, a retired German professional footballer, is known for his height and physical presence on the field rather than his speed. As a result, it is unlikely that he would be very fast on a 100m sprint. While it is difficult to estimate an exact time without knowing his specific sprinting abilities, it is safe to say that he would not be among the fastest sprinters in the world. **

Yes, there have been bigger footballers in the German national team than Per Mertesacker. One notable example is Stefan Kuntz, who stood at 201 cm. Additionally, there have been other players who were close in height to Mertesacker, such as Jens Lehmann and Manuel Neuer, both of whom are goalkeepers. Therefore, while Mertesacker was certainly tall, he was not the tallest player to have represented the German national team. **

The valves on heating pipes are typically ball valves or gate valves. Ball valves have a spherical disc inside that controls the flow of water by rotating the handle, while gate valves have a gate or wedge that moves up and down to control the flow. Both types of valves are used to regulate the flow of hot water through the heating system and can be manually operated to adjust the temperature or shut off the flow completely. **

Yes, there have been greater footballers who have played for the German national team than Per Mertesacker. One notable example is Lothar Matthäus, who is considered one of the greatest German footballers of all time. Matthäus made 150 appearances for the national team and had a highly successful career, winning the World Cup in 1990 and being named FIFA World Player of the Year in 1991. Another example is Miroslav Klose, who holds the record for the most goals scored in World Cup history and made 137 appearances for the German national team. **

In general, football players are not typically timed for a 100m sprint as it is not a common measurement in the sport. However, based on their playing styles and positions, players like Mertesacker and Toni Kroos are known for their tactical awareness, passing abilities, and positioning rather than their speed. It is more common to measure their performance in terms of passing accuracy, vision, and decision-making on the field rather than pure sprinting speed. **

On average, the slowest football players can run 100m in around 14-15 seconds. Players like Per Mertesacker and Toni Kroos, who are known for their slower pace on the field, may take a few seconds longer to complete the distance. However, it's important to note that football players' speed can vary depending on various factors such as age, fitness level, and playing position. **

Yes, the consumption of energy-saving pumps may increase when replacing heating pipes. This is because energy-saving pumps are designed to operate more efficiently and effectively with newer heating systems and pipes. The improved performance of the energy-saving pumps may lead to increased usage, as they are able to distribute heat more evenly and effectively throughout the system. Additionally, the replacement of old pipes with newer, more efficient ones may also contribute to increased energy consumption, as the system may be able to operate more efficiently overall. **