Hot water recirculation

Assumptions: 

Assuming that an average household consists of 3 persons in average water waste a year is estimated to be 16.425 liters equals 66 bathtubs and 37 hours waiting a year 

1. Number of times a person is waiting a day for water to get hot at a faucet is estimated to be 5 https://energysavingtrust.org.uk/sites/default/files/reports/AtHomewithWater(7).pdf  
2. Number of liters wasted each time at a faucet is estimated to be 2 liters, with a faucet having a flow of 6 liters per minute https://ec.europa.eu/environment/ecolabel/documents/Sanitary%20Tapware%20Factsheet.pdf
3. Number of times a person is waiting a day for water to get hot in a shower is estimated to be 1 https://energysavingtrust.org.uk/sites/default/files/reports/AtHomewithWater(7).pdf  
4. Number of listers wasted in the shower each time is estimated to be 5 liters with a shower head having a flow of 15 liters per minute https://ec.europa.eu/environment/ecolabel/documents/Sanitary%20Tapware%20Factsheet.pdf
5. According to the research organisation PRB the average number of people living in a household in Europe is 2,4. Rounded up this gives an average of 3 persons per household.
   https://www.prb.org/international/indicator/hh-size-av/map/country/
6. Waiting time for hot water is estimated to be 20 seconds each time.  
   
7. Length of the pipe from the water source/heater to the faucet and shower head is estimated to 20 meters 
8. The bathtub size is estimated at 250 liters
   https://www.badeloftusa.com/ideas/how-much-does-bathtub-hold/

Sources: 

Energy Saving Trust (2013) "Water at home - The biggest ever review of domestic water use in Great Britain"
https://energysavingtrust.org.uk/sites/default/files/reports/AtHomewithWater(7).pdf (1, 3) 

Sustainability Info (2021) "How much Water does a Faucet Use
https://sustainabilityinfo.com/water/how-much-water-does-a-faucet-use/ (2, 4) 

PRB (2020) PRB’s World Population Data Sheet "Average household size" 
https://www.prb.org/international/indicator/hh-size-av/map/country/ (5)

Badeloft (2021) "How Many Gallons Does a Bathtub Hold?"
https://www.badeloftusa.com/ideas/how-much-does-bathtub-hold/ (8) 

Estimated savings:  

Replacing a UPS 6m, speed III with a new HWR pump from Grundfos 

Old UPS 6m - speed III - Watt use: 90W - Time running a day: 24 hours* - Watt use a day: 90W 

New COMFORT BASIC - Watt use: 7W - Time running a day: 24 hours* - Watt use a day: 7W - Savings: 92% 

New COMFORT DT - Watt use: 7W - Time running a day: 10,5 hours** - Watt use a day: 3W - Savings: 97% 

New COMFORT AUTOADAPT - Watt use: 7W - Time running a day: 2,5 hours - Watt use a day: 0,7W - Savings: 99% 

New ALPHA N 25-60 180  - speed II - Watt use: 28W - Time running a day: 24 hours* - Watt use a day: 28W - Savings: 69% 

New UPS N 20-60-180 - speed II - Watt use: 70W - Time running a day: 24 hours* - Watt use a day: 70W - Savings: 22% 

^{* With no external timer installed} 

^{** COMFORT DIGITAL TIMER has a factory default setting where 21 enabled 30 minutes time slots are activated} 

Supporting facts: 

Eco Friendly Habits (2021) "Water Waste Facts: Stats About Water Consumption & Usage"
https://www.ecofriendlyhabits.com/water-wasting-facts/  

Energy Efficiency Standards Group, Energy Analysis and Environmental Impacts Division (2011) "Water and Energy Wasted During Residential Shower Events: Findings from a Pilot Field Study of Hot Water Distribution Systems"
https://energyanalysis.lbl.gov/publications/water-and-energy-wasted-during

Energy Efficiency Standards Group, Energy Analysis and Environmental Impacts Division (2011) "Water and Energy Wasted During Residential Shower Events: Findings from a Pilot Field Study of Hot Water Distribution Systems"
https://eta-publications.lbl.gov/sites/default/files/water_and_energy_wasted_during_residential_shower_events_findings_from_a_pilot_field_study_of_hot_water_distribution_systems_lbnl-5115e.pdf  

Better Heating Systems

Sources behind the stated facts: 

1. Fact: Pumps are responsible for 10% of the total electricity in the world.
   Source: https://www.searchingindustrial.com/media/1078/pumps-could-change-the-world-again
   
   
2. Fact: With a noise level at or below 29 dB(A), the sound emitted by ALPHA pumps, is quieter than a whisper at 30dB(A).
   Source: Sound power values L WA determined according to ISO 20361 1), ISO 3745 and ISO 4871.
   
   
3. Fact: Research shows that 82% of heating systems in existing buildings in Germany alone in 2017, were incorrectly balanced.
   Source: CO2 online, 2017
   
   
4. Fact: After this, your customers will have a system that not only provides better indoor comfort, but one that can offer between 5-20% energy savings annually.
   Source: Study of FH Münster, 2015
   
   
5. Fact: Insufficient commissioning can cause up to 20% overconsumption of energy and poor comfort for your customers.
   Source: Study of FH Münster, 2015
   
   
6. Fact: Roughly 82% of all heating systems are incorrectly commissioned.
   Source: CO2 online, 2017
   
   
7. Fact: And they could reduce energy consumption by up to 20%.
   Source: Study of FH Münster, 2015
   
   
8. Fact: Did you know that 200 million circulators worldwide are inefficient and 100 million in Europe alone?
   Source: This is calculated using a combination of Grundfos sales in both OEM and Trade, market share information and a model that estimates the average lifetime of the components within the circulators.
   
   
9. Fact: Pumps that are over 10 years old are usually far less efficient than current models. In fact, replacing an old circulator can save up to 75% energy consumption.
   Source: Grundfos calculations based on product information: Old UPS (CC curve): 358,9 kWh/y - ALPHA2 AUTOADAPT 56,7 kWh/y
   
   
10. Fact: Replacing an old circulator in a heating system can save energy, up to 75%!
    Source: Grundfos calculations based on product information: Old UPS (CC curve): 358,9 kWh/y - ALPHA2 AUTOADAPT 56,7 kWh/y
    
    
11. Fact: For a typical family, that's about the same energy it takes to run the TV all year.
    Source: LCD TV running 3 hours a day - 230 kWh/y
    
    
12. Fact: EU regulations are shaping the market for hydronic heating systems and we need to think differently when it comes to heating systems in order to reach EU's climate goal of cutting at least 40% of greenhouse gas emissions by 2023. 
    Source: https://climate.ec.europa.eu/eu-action/climate-strategies-targets/2030-climate-energy-framework_en 
    
    
13. Fact: Reducing greenhouse gases by 40% by 2030: Just about everyone would rather their heating bill was lower, but more people today want their heating system to be more sustainable too. With that in mind, the EU has pledged to cut 40% of its greenhouse emissions by 2030.
    Source: https://climate.ec.europa.eu/eu-action/climate-strategies-targets/2030-climate-energy-framework_en 
    
    
14. Fact: Your client will experience a comfortable, quiet home and may save up to 5-10% on their electricity consumption due to the new heat pump.
    Source: https://iea.blob.core.windows.net/assets/01324438-d634-4d49-95d8-3d08aaab00d5/TheFutureofHeatPumps.pdf
    
    
15. Fact: Heat pumps can save 16% of total European Union energy use. 32% when looking at heating and cooling systems alone.
    Source: https://iea.blob.core.windows.net/assets/01324438-d634-4d49-95d8-3d08aaab00d5/TheFutureofHeatPumps.pdf 
    
    
16. Fact: Traditional boilers typically operate with forward temperatures of up to 80 degrees Centigrade. To keep operation efficient, heat pumps should operate at the lowest possible flow temperature, preferably below 55 degrees centigrade.
    Source: https://iea.blob.core.windows.net/assets/01324438-d634-4d49-95d8-3d08aaab00d5/TheFutureofHeatPumps.pdf 
    
    
17. Fact: When the heat pump is installed and commissioned correctly, the conversion from renewable energy to useful heat becomes very efficient, and the householder will experience a comfortable, quiet home and may save up to 10% on the electricity consumption of the heat pump.
    Source: https://iea.blob.core.windows.net/assets/01324438-d634-4d49-95d8-3d08aaab00d5/TheFutureofHeatPumps.pdf 
    
    
18. Fact: Old functioning pumps use up to 17 times the energy of a new Grundfos pump.
    Source: Grundfos calculations based on product information: Old UPS (CC curve): 84 watt - ALPHA2 AUTOADAPT 5 watt
    
    
19. Fact: But there’s an easy way you can go from consuming 84 watts to a mere 5 watts, just by replacing your heating pump.
    Source: Grundfos calculations based on product information: Old UPS (CC curve): 84 watt - ALPHA2 AUTOADAPT 5 watt