A luxury hi-end apartment block in Melbourne’s inner north required a new pool heater boiler to replace the existing unit installed which had failed. The new boiler system was required to heat the outdoor rooftop lap pool all year round, and a reliable and energy efficient system was critical.
HydroHeat replaced the existing type boiler with 2 x BAXI MP+ 70kW gas condensing boilers. The Baxi MP+ 70 kW boilers are mounted internally, and due to the poor air quality of internal plant rooms, the boilers are installed completely room sealed. A room sealed boiler means that the air used for the combustion of the gas is drawn in from the flue and then waste gas is removed back out through the flue. The air inside the boiler is completely separated from the air circulating in the room where the boiler is installed. This is critical in a pool room environment where the surrounding air can impact the longevity of the boiler and lead to corrosion.
Baxi gas condensing technology in the MP+ makes the boilers super efficient as the condensing pre-mix burner reuses waste flue gases and reduces noxious waste. With pool heating requirements generally at 26º to 30º the boiler can maintain its maximum design efficiency of Gross 97% (Gross Efficiency according to AS4552)
In addition, the boilers are installed in cascade and cycle according to the heat load to further increase energy and cost savings and provide a constant even temperature in the pool. The 2 x MP+ 70 kW Boilers operate in cascade and have a modulation range of 1:18 (2 x 1:9) which means the boilers can reduce in capacity to 1/18th of their maximum, making the system far more efficient as only energy is used that is required. In addition the BAXI boilers modulate in cascade which means that the complete pool heating system modulates in entirety, i.e. The second Boiler is only commissioned when heat load demands. Greater efficiency is created as Boilers are only brought online consistent with heat requirements/loads.
Cascade operation also benefits maintenance in the event of one boiler requiring servicing or being offline, the end user will always have a part load (redundancy).