Enquiry for water heater to import to Kuwait

we have many project with our customer in hand , one of them hotel .
the equipment of hotel , and try to reduce the capacity of the heaters, as the size of the heaters in this attached is big and the contractor ask to reduce the capacity for heaters in a way that does not reduce their service to the hotel , so please we ask you to do the calculation of the heaters with the best price you can give us to get the project