Hello everyone,
We have a buffer tank with a capacity of 150 liters (40 gallons) planned, and there will be a total of 3 showers in the building. I would like to be able to run at least 2 of them simultaneously with hot water.
All showers are Raindance overhead rain shower heads with a water flow of about 15 to 17 liters per minute (4 to 4.5 gallons per minute) of mixed water (1 x S300 and 2 x S120).
Hot water is generated by the Cerapurmodul 9000 i model GC9000iWM20/100S23 (maximum nominal heat output for hot water is 30 kW). According to the manufacturer, it should produce up to 15 liters (4 gallons) of hot water per minute.
This all sounds plausible to me. However, since I don’t want to regret it later, it would be great if someone with practical experience could share whether the water actually stays warm when using the showers simultaneously.
We have a buffer tank with a capacity of 150 liters (40 gallons) planned, and there will be a total of 3 showers in the building. I would like to be able to run at least 2 of them simultaneously with hot water.
All showers are Raindance overhead rain shower heads with a water flow of about 15 to 17 liters per minute (4 to 4.5 gallons per minute) of mixed water (1 x S300 and 2 x S120).
Hot water is generated by the Cerapurmodul 9000 i model GC9000iWM20/100S23 (maximum nominal heat output for hot water is 30 kW). According to the manufacturer, it should produce up to 15 liters (4 gallons) of hot water per minute.
This all sounds plausible to me. However, since I don’t want to regret it later, it would be great if someone with practical experience could share whether the water actually stays warm when using the showers simultaneously.
T
toxicmolotof16 May 2016 11:39Seriously? No calculator handy?
150/30 = 5
5 × 15 = 75
75 / 30 = 2.5
2.5 × 15 = 37.5
So I estimate that the tank will be empty after 8 minutes.
If the production and storage temperatures are higher than the shower usage temperature, you could probably manage even longer.
I think it will usually work out because people are unlikely to coordinate their showering times, let alone shower synchronously for 20 minutes.
150/30 = 5
5 × 15 = 75
75 / 30 = 2.5
2.5 × 15 = 37.5
So I estimate that the tank will be empty after 8 minutes.
If the production and storage temperatures are higher than the shower usage temperature, you could probably manage even longer.
I think it will usually work out because people are unlikely to coordinate their showering times, let alone shower synchronously for 20 minutes.
H
HilfeHilfe16 May 2016 11:54Hmm, there’s no bathtub? Then the 150 liters are used up quickly...
I think we have 250 liters and 2 showers. My wife really enjoys showering and takes long showers.
I think we have 250 liters and 2 showers. My wife really enjoys showering and takes long showers.
T
toxicmolotof16 May 2016 12:09Looking at it the other way around, the hot water system can continuously support one shower. Therefore, the storage tank must be sufficient for a second shower. 150 liters at 50 degrees Celsius (122°F) roughly equals 250 liters at 38 degrees Celsius (100°F) ... so after 8 minutes, that’s also not enough.
As long as person number two manages with 10 minutes, in my opinion, it should be sufficient.
Our 250-liter tank only runs out when the shower and bathtub are used simultaneously, and the bathtub is refilled repeatedly over the course of an hour.
And even then, only because we disconnected the electric instant water heater in the heat pump.
As long as person number two manages with 10 minutes, in my opinion, it should be sufficient.
Our 250-liter tank only runs out when the shower and bathtub are used simultaneously, and the bathtub is refilled repeatedly over the course of an hour.
And even then, only because we disconnected the electric instant water heater in the heat pump.
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