Gridly
Overview
The Reclaim 400L CO2 is the top of the Reclaim range - the largest tank in the CO2 segment and the most expensive heat pump in this entire comparison at $6,500 supply. It is designed for a specific buyer: a large household or high-demand property in a cold climate or with a large solar PV system that needs CO2 performance in a volume that smaller units cannot provide.
For most Australian households, this is more hot water capacity than they need. The Reclaim 315L at $5,500 serves up to 6 people comfortably. The 400L is relevant at 6+ people, in shared accommodation scenarios, or for properties with unusually high hot water demand.
When 400L makes sense
The standard sizing formula for heat pump hot water is approximately 60L per person per day for Australian conditions. At this formula:
- 2 people: 120L → 250L tank (generous buffer)
- 3–4 people: 180–240L → 250L or 315L tank
- 5–6 people: 300–360L → 315L or 400L tank
- 6–8 people: 360–480L → 400L tank is appropriate
The 400L is specifically relevant for the 6–8 person range where the 315L runs close to its daily capacity and consecutive evening or morning showers risk depleting the tank before the heat pump has time to fully recover.
CO2 at scale
CO2 heat pump systems operate at significantly higher pressures than R290 or R134a systems - typically 100–130 bar in the high-pressure circuit. The Reclaim 400L’s refrigerant circuit is engineered for these pressures in a large-format configuration. Installation requires a CO2-certified installer, and the cost of that installation is higher than standard R290 work.
For buyers committing to a $6,500 system, the quality of the installation is particularly important. Confirm your installer’s CO2 certification and experience with Reclaim systems specifically before scheduling installation.
Who should buy the Reclaim 400L CO2
Large households of 6+ people in cold Australian climates or with large solar PV systems who need the thermal storage capacity that 315L cannot provide. For buyers in warm climates with households under 6 people, the 315L or 250L are more cost-effective choices within the Reclaim range, and R290 alternatives from iStore or Ecogenica are more cost-effective outside the Reclaim range.
