You simply cannot buy a better tankless water heater. Each of the tankless water heaters on our shortlist is a top choice in its price/performance bracket. However, the overall winner of our âBest of the Bestâ award is definitely the Stiebel Eltron Tempra 24 Plus.
The difference between the lux and the lumen is that the lux takes into account the area over which the luminous flux is spread. 1000 lumens, concentrated into an area of one square metre, lights up that square metre with an illuminance of 1000 lux.
To illustrate the difference between lumens and lux: While the sun always produces the same number of lumens, on cloudy days there are fewer lux outdoors. At night, only the lumens provided by the moon and stars reach the ground, leading to extremely low lux under a night sky.