Extremely high pellet consumption (200kg in 3 days) in a Kfw70 multi-family house!

  • Erstellt am 2016-11-09 14:35:35

rudiherbert

2016-11-09 14:35:35
  • #1
Good day.

I just noticed the following with our pellet heating system (6-family new build Kfw70). It is a new build, and the first winter....

The consumption in October (which was very mild in Bavaria) was 1000kg. Now the current consumption is 200kg over 3 days! Projected, that is 2 tons per month! Although the temperatures are now a bit colder, there is still no sign of a harsh winter!

I noticed the following about the pellet heating system (Eta 20-30). Floor heating temperature 56 degrees at 1 degree outside temperature. Supply temperature of the floor heating in the heating room 30 degrees? Same as the return!?
Display of the supply temperature in the apartment 38 degrees with active room thermostat. With inactive thermostat 20 degrees.

The buffer tank is supported by collectors on the roof (hot water + heating).

I am sure that this consumption can never be correct! The new build is well insulated. The construction is dry! Everyone heats "properly" and ventilates according to the rules.

2 tons of pellets per month in winter is extreme! In October we had 1 ton. In summer 500kg per month.

Before I contact the heating engineer or the property management, I wanted to get some tips here.

Thank you
 

Legurit

2016-11-09 14:41:14
  • #2
Calorific value of 960 kWh... so 53 kWh per day and apartment. We have about the same in our house – not so abnormal; however, rather high if you consider that a house has more exterior walls ;-) Take a look at the consumption distribution of heaters... if you have 500 kg in summer (for what??? - you have ST for hot water) and 1 ton in the transitional month, 2 tons for a cold month is fully within range.
 

Basti2709

2016-11-09 14:56:25
  • #3


Probably rather 20 tons per month...?
 

Legurit

2016-11-09 15:00:25
  • #4
No, he writes 200 kg over 3 days... that would be more like 6 tons - right?
 

RobsonMKK

2016-11-09 15:02:21
  • #5
About 70kg per day times 30 days comes out to around 2 tons.
 

Musketier

2016-11-09 15:02:23
  • #6


Do you calculate the same way at work?;)
 

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