Hello everyone!
I haven’t seen such contradictory information online about the issue of Legionella combined with modern heat pumps for a long time.
Many people (including us) keep the domestic hot water temperature fairly low to save energy. Ours is set to 45°C (113°F), but realistically it usually heats up to around 48–49°C (118–120°F), and in summer, when we have excess electricity from the solar panels, it can be even higher.
Our heat pump has an anti-Legionella program, but our installer turned it off. He explained why, but I don’t remember the details. Is that a reasonable approach?
We currently have no problems, but of course, I don’t want to unintentionally create a Legionella breeding ground.
We have a Tecalor THZ 504 with a 235 L (62 gallons) hot water tank. We don’t have any unused tap points in the house—all faucets are used regularly. We also sometimes drain the tank quite a bit—at least when we bathe our child and then I bathe, I sometimes want to run more hot water but there’s barely any left. We don’t have a circulation line.
Online, opinions range widely—from people dismissing the concern as complete alarmism to others predicting a global disaster caused by Legionella.
So where is the truth, especially regarding:
Should I increase my target hot water temperature from 45°C (113°F)? and
Should I activate the heat pump’s Legionella program, and if so, how often?
Best regards,
Kati
I haven’t seen such contradictory information online about the issue of Legionella combined with modern heat pumps for a long time.
Many people (including us) keep the domestic hot water temperature fairly low to save energy. Ours is set to 45°C (113°F), but realistically it usually heats up to around 48–49°C (118–120°F), and in summer, when we have excess electricity from the solar panels, it can be even higher.
Our heat pump has an anti-Legionella program, but our installer turned it off. He explained why, but I don’t remember the details. Is that a reasonable approach?
We currently have no problems, but of course, I don’t want to unintentionally create a Legionella breeding ground.
We have a Tecalor THZ 504 with a 235 L (62 gallons) hot water tank. We don’t have any unused tap points in the house—all faucets are used regularly. We also sometimes drain the tank quite a bit—at least when we bathe our child and then I bathe, I sometimes want to run more hot water but there’s barely any left. We don’t have a circulation line.
Online, opinions range widely—from people dismissing the concern as complete alarmism to others predicting a global disaster caused by Legionella.
So where is the truth, especially regarding:
Should I increase my target hot water temperature from 45°C (113°F)? and
Should I activate the heat pump’s Legionella program, and if so, how often?
Best regards,
Kati
N
nordanney28 Feb 2021 12:49kati1337 schrieb:
We have no unused water outlets in the house; we use all our taps regularly. We also often drain the water heater quite a bit – at least when we bathe our child and then I take a bath, I’ve noticed that sometimes I want to run more hot water afterward, but hardly any comes out. We don’t have a circulation pipe.Then just sit back and relax.Similar topics