ᐅ Air-to-water heat pump Tecalor 8.5: Warm water – not hot in the morning

Hello everyone,

At 6:30 AM, the hot water for showering is unfortunately not yet fully hot, despite the heating circuit of our heat pump being set to operate between 5:00 AM and 10:00 PM. Normally, with this setting, the hot water should already be completely hot by 6:30 AM, right?
It is very warm but not hot – this only happens early in the morning.

What setting could be causing this?

Air-to-water heat pump: Tecalor 8.5

I appreciate any help.

Probably not enough peak power.
The output is divided between heating and hot water. Just set it to start half an hour earlier.

rick2018 schrieb:

Probably not enough peak power.
The output is divided between heating and hot water. Just try setting it to start half an hour earlier.

Ah, okay – I’ll just give that a try!

How long does it typically take for the water to heat up completely again?

One bath and one shower running at the same time = just enough hot water 😀

If a third person wants to shower, how long would you roughly have to wait? Is there an approximate estimate? I honestly have no idea if it could be 15 minutes or 2 hours xD

Prager91 schrieb:

basically

There is no such thing as "basically."
Hot means 38 degrees or even 55 degrees. The latter is usually set on the heating system and then mixed with cold water to achieve a comfortably warm-hot temperature.

Prager91 schrieb:

1 bath and 1 shower at the same time = just enough hot water 😀

Do you have a small hot water tank? Or do you shower too long? Or is your bathtub too big? Or do you use up too much hot water and have to add too much cold water?
A 70-liter (18-gallon) tank empties fairly quickly within 7–10 minutes, while a 300-liter (79-gallon) tank takes longer to empty.

ypg schrieb:

Basically, there isn’t a standard answer to that.
Hot water can be around 38°C (100°F) or even 55°C (131°F). The latter is usually set on the heating system and then mixed with cold water to reach a comfortably warm-hot temperature.

Do you have a small hot water tank? Or are you showering too long? Or is your bathtub too large? Or are you using up too much hot water and have to add too much cold water?

If I’m correct, the tank is 240 liters (63 gallons) — but I’ll double-check. The heating technician said that should be enough, but it might be the case that after one bathtub fill and one shower, there isn’t enough hot water left for a second shower.

With an oversized tank, there is also the risk of bacteria or legionella, right? That’s what I assume...

The bathtub is a standard size: 170 x 75 cm (67 x 30 inches).

Prager91 schrieb:

If the system is oversized, there is also a risk of bacteria or Legionella – right? That’s what I assume...

It should not be set below 55 degrees Celsius (131°F).

Prager91 schrieb:

240-liter (63-gallon) storage tank if I’m correct – but I will check again. The heating engineer said this should be sufficient – however, it might be that after filling one bathtub and one shower, there isn’t enough hot water left for another shower.

What are your experiences? Is it enough or not?

As mentioned before: the heating engineer cannot know your personal habits. One person showers at 36 degrees Celsius (97°F), another needs 42 degrees Celsius (108°F). One shower lasts 10 minutes, another only 2. All these factors affect how far the storage tank’s capacity will go. If it’s not enough, you could still increase the temperature, for example from 60 to 65 degrees Celsius (140 to 149°F).