One of the demo projects listed in the linked white paper is aiming for >50% of theoretical efficiency in that temperature range > LowCapex and FUSE (TNO): Dem

One of the demo projects listed in the linked white paper is aiming for >50% of theoretical efficiency in that temperature range > LowCapex and FUSE (TNO): Demonstration of heat pump technology on an industrial scale (2 MW), producing process steam at temperatures between 120°C to 150°C from waste heat at 60°C to 90°C with efficiencies above 50 % of the theoretical maximum. Elsewhere in the white paper: > Comparing these alternatives, it has been shown that high temperature heat pumps, with COPs as low as 2, are competitive in levelized cost of heat with biomass boilers and natural-gas based boilers under consideration of a CO2 tax of 50 €/tonne. So... definitely not slam dunk.