How do you heat an 11x7 meter indoor swimming pool using a diesel heater or heat pump?

To heat an 11x7 meter indoor swimming pool, you can use a diesel heater by installing it near the pool and connecting it to the pool's circulation system. The heater will burn diesel fuel to warm the water, which is then pumped into the pool. Alternatively, a heat pump can be used, which extracts heat from the surrounding air and transfers it to the pool water; this is more energy-efficient, especially in moderate climates. Ensure proper insulation and cover the pool when not in use to retain heat and improve efficiency.