Indoor domestic hot water heat pumps (DHW HPs) using R134A refrigerant have been available for nearly 30 years. Despite this, a portion of models sold in 2025 still utilize R134A. We understand the likely reasons: installers may prefer simplicity, selling models recommended by local brands or those they already stock. […]

Stainless Steel Anti-Corrosion Performance Difference in Domestic Hot Water Heat Pump? For a domestic hot water heat pump, the water tank stainless steel materials always have three options: Duplex 2205, SS316L and 304. In the anti-corrosion performance aspect, Duplex is better than SS316L, and SS316 is better than SS304. The