![]() In contrast, the Energysavers instantly produce a jet of hot air. However, a heat pump can take a while to get going, especially as the outdoor temperature falls (in the same way your car’s heater blows chilly air for the first few minutes on cold mornings). The experience: Heat pumps and gas heaters warm through convection, using a fan to circulate warm air, rather than by radiating heat directly at you, like a woodburner or bar heater. The 309FT, which has a lower heat output (3.1kW), took nearly 10 minutes to achieve a 5☌ temperature rise and only increased the temperature to 16☌ after half an hour.Įvenness: Both gas heaters warmed the room as evenly as a heat pump would, with just over 1☌ variation between the warmest and coldest parts of the room. Its performance is comparable to a similar-sized heat pump. This excellent result wasn’t surprising as the 5.3kW unit is designed to heat rooms as large as 82m². Heat-up time: In just over 5 minutes, the 559FT raised the temperature by 5☌, and within half an hour had our lab at a balmy 23☌. ![]() ![]() After stabilising the lab’s temperature at 8☌, we cranked the heater’s thermostat to maximum and started timing. Both heaters are floor-mounted units and, like heat pumps, are costly to shift once installed. We assessed the Energysavers in an expanded version of the thermal comfort laboratory we use to test electric heaters - 5m wide by 6m deep and with a 2.4m-high insulated ceiling. Performance Energysaver 309FT (left), Energysaver 559FT (right)
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