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The Heat pump heats the water tank during 'off-peak' hours twice per day, every day (these are my new settings). The 'Ecodan' unit is only capable of reaching 55C so an immersion heater is included within the water cylinder to take the water tempature up to 60C and killing any legionella bacteria in the process.
Feb 2, 2015 · Ideally, you want to heat the water up, then use it all up within hours. When heating the cylinder up from cold, the efficiency is very good, because the boiler can output at 60 degrees, and return cold, producing lots of condensation.
- What Is Stagnant Water?
- So How Accurate Are Your Measured temperatures?
- Scalding
- Efficiency
- What Temperature Should I Keep My Hot Water?
- Risk Assessment
- Unused Outlet Risk
- What Is The Minimum We Can Set Our Hot Water?
- Sterilisation / Pasteurisation Or Anti-Legionella Cycles
- Guide
Stagnant water is hard to define as its relative to both the store volume and time. For example, water heaters termed as ‘instantaneous water heaters’ or combination boilers will have a very high turnover, a small wash of your hands will typically turn over all the hot water content and aren't really deemed as a high risk. Conversely larger store v...
Because cylinder stats are located a third of the way up your cylinder, the temperature at the top will likely be a few degrees above your stat temperature due to stratification. Below the stat will be between 10°C and the set temperature, but for safety assume it's all the same temperature Cylinder stats also have a hysteresis. So for example, thi...
Setting hot water to 60°C for a vulnerable person can be extremely dangerous. Look at this table below and you'll see that first degree burns happen in 2 seconds for the elderly at 60°C. This is exacerbated by the time it takes for the brain to register the temperature which increases as you get older! An elderly person that only turned on their ho...
The last consideration, outside of safety, is running costs and efficiency. If you have a heat pump or condensing boiler, the efficiency at your heat source can be increased if lower flow temperatures are targeted. Additionally a cooler cylinder will lose less energy into the surrounding air. Hot water stored at 50°C will have a 20% lower heat loss...
If you want a simple answer, stick around to the end, however, as we always say, there is no panacea and if you want to know the proper answer for your specific property, first we must do a risk assessment.
Age
If you're above 50 years of age or have an autoimmune disease or regularly have elderly guests then your risk is higher and more caution is needed, yes it may cost more, but it's also safer. Conversely if you don't have temperature limiters at your outlets, scalding is potentially a higher risk also, particularly if you have younger children.
Turnover
If you have stored hot water, but you don't turn it over more than say 50% a day, for example 2 of you only have 1 shower a week then you are at high risk of legionnaires disease… and potentially lots of things if you don't shower anywhere else.
In domestic dwellings all hot water outlets will probably be used regularly, so your pipework is unlikely to need sterilising with 60°C water. In the vast majority of domestic situations storing water at 50°C would be perfectly adequate. Infact 50°C is the temperature most hot water controls from Honeywell, Viessmann and Vaillant and Worcester come...
If you deem yourself as particularly low risk with high water turnover, the absolute minimum temperature you would theoretically set hot water to is 40°C. This is a little hotter than average showering temperatures but may be too cool for washing dishes if you don't have a dishwasher. It also may need bumping up a few degrees if it causes issues wi...
If you do store hot water as low as 40 to 49°C we would suggest at least being aware of anti-legionella cycles (ALC). This is essentially where hot water temperatures are temporarily increased to kill off any bacteria that might have formed. If your water is fully turned over once every day or so on average this won't be needed. But if you are part...
SoOOOOOooo for YOUR specific situation. The name of the game is to get the store temperature as low as possible while keeping safe. The vast majority of homes will even be fine at 50°C,but if you want to increase the efficiency of your gas boiler, or the SCOP of your heat pump, AND reduce the amount of heat lost from the cylinder by keeping it cool...
Feb 22, 2016 · Water heater cycling is the turning on and off of water heaters many times over short durations. It wastes energy and can affect the life of the water heater. A cycle starts when the temperature sensor closes the contacts to start the heater.
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- Benjamin Gagnon
- info@wagonofmeat.com
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In terms of how long it takes for the water inside your heater to get hot will depend on the type of heater you have. Gas water heaters take roughly 40 minutes to heat the water, while an electric heater will take longer, between approximately 60 to 80 minutes.
