A low-pressure cylinder costs $900–$1,600 installed; a mains pressure cylinder costs $1,800–$3,000 installed. Mains pressure delivers stronger water flow and is the standard for new and renovated Christchurch homes.
Low pressure (LP): Fed from a header tank, operates below mains pressure. Common in older Christchurch homes (pre-1990). Lower flow rates at the hot tap can make showers feel weak.
Mains pressure: Connected directly to supply at full pressure. Strong, even flow at all outlets simultaneously. Standard in all new builds.
Yes — very common in Christchurch. Upgrading includes removing the header tank, running new connections, and installing the mains pressure cylinder. Total upgrade cost is typically $2,200–$3,500.
Almost always. Mains pressure delivers better shower pressure, allows multiple outlets simultaneously without pressure drops, and is more compatible with modern fixtures. If you're replacing the cylinder anyway, paying extra to go mains pressure is usually worthwhile.