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Vaillant ved 21 77/3/2023 ![]() There is no sense in paying to heat up water to a temperature higher than you need it only to have to cool it down later with cold water. I think that we can assume that 10 l/m is an approximate upper limit for this heater to produce shower water. If the OP is using 10 l/m the heater will only raise the temperature with 30 degrees, giving ~40 degrees output temperature (not much room left for mixing with cold water.). However, more likely the input temperature will be ~10 degrees, giving ~54 degrees output (at 7 l/m). So it seems they only guarantee this level of output temperature. So at 1 degree input you would get ~45 degree output = the middle setting of the temperature knob. They state the input temperature 1.25 degrees.Ģ1 kW at 7 l/m can only heat the water with ~44 degrees. If you read the "Teknische daten" more carefully you'll notice that they don't guarantee the output temperature. The difference in weight ( "3.)" - "1.)" ), messured in Kilogramm equals to the number of liters your shower actually does per minute.Īlmost correct. ![]() It means "We promise to be capable of reaching 60☌ as long you don't demand more than 7 liters per minute".īest would be to measure how much the OP's shower really does:ġ.) Take an empty bucket and stand on your bathroom scale with that bucket in your hand.Ģ.) start the shower the way you usually use it and let the water flow into the bucket for exactly one minute.ģ.) Get back on the scale, now with the filled bucked in your hand. The "Maximum 7 liters per Minute" as mentioned in the user manual is not a flow restriction within the device due to an orifice. ![]() Your calculation itself is correct, but you interpret the flow restriction in the manually wrongly, IMHO. I'm sure someone will correct me if I'm wrong but given that limit I suspect the amount of water heated, the energy required and yearly cost would be Franklans results multiplied by 7/11: The investment in a showerhead with reduced water flow might also be considered (look for "Wassersparduschkopf" on ). switch on the water, get wet, switch off the water, get soapy intensively, switch on the water, rinse, switch off and get out. To reduce costs I'd suggest to reduce the time you have the water running, e.g.
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