Gridly
Overview
Emerald is an Australian-designed brand that has been in the domestic heat pump market since 2006. The distinguishing feature of the Emerald range is not raw efficiency (COP 4.9 is competitive but not leading) but the warranty tier system: buyers can choose their coverage level rather than accepting a single manufacturer-defined term.
For buyers who want a 10-year warranty on an R290 all-in-one unit - previously only available from CO2 systems at $5,000+ - the Emerald Ultra tier delivers this at a mainstream price.
The tiered warranty: understanding what you’re buying
Warranty tiers are the most important concept to understand before purchasing an Emerald unit:
Select: 5-year parts, 2-year labour. The baseline. Adequate but not exceptional.
Pro: 7-year tank, 5-year parts, 5-year labour. A strong mid-tier option that improves labour coverage substantially - most failures in years 3–7 are covered for both parts and call-out.
Ultra: 10-year tank, 5-year parts, 5-year labour. The headline figure. On the 270L and 320L models, this is confirmed available. For the 220L, confirm current Ultra availability with your installer.
The risk is that the tier isn’t clearly communicated at point of sale. Emerald equipment across all tiers is physically identical - the warranty tier is on the documentation, not the unit. Confirm in writing which tier your quote includes and what the warranty document specifies.
COP 4.9 and DC inverter mechanics
COP 4.9 positions the Emerald 220L alongside the iStore 270L (COP 4.82) and well above R134a competitors (COP 3.9). The DC inverter compressor is the reason for this efficiency - it modulates output to match demand rather than binary on/off cycling.
The efficiency benefit is most visible in mild weather when the tank is already warm and only topping up is needed. A fixed-speed compressor runs at full power until temperature is reached, then cuts out. The inverter compressor slows to a lower speed to maintain temperature more efficiently.
Noise: standard vs silent mode
49 dB(A) in standard mode is audible from 5 metres away - comparable to a running dishwasher. For installations adjacent to bedrooms, living rooms, or fence-lines near neighbours’ properties, this is the relevant number. Silent mode reduces this to approximately 45 dB(A), which is a meaningful improvement for noise-sensitive locations.
The silent mode trade-off is a slightly longer heating time for the same volume of water, as the compressor runs at lower speed. For most households charging overnight or during solar hours, this is inconsequential.
Who should buy the Emerald 220L
The Emerald 220L is the right choice for 2–3 person households who want DC inverter efficiency, built-in Wi-Fi scheduling, and the flexibility to choose their warranty coverage level. The Pro tier at $200–$400 extra is usually worth it for the improved labour coverage. For 4-person households, the 220L tank may run short under heavy morning demand - consider the Emerald 270L.
