Annual consumption of pellet boiler OKOFEN

[logredudon]

Hi,

I would like to know feedback on annual consumption (in tonnes) of pellets for owners of okofen boilers (or others)

Personally, I have a house of 120m2 (underground, ground floor, attic, construction in monomur 37.5, insulation of glass wool attic 24cm).

Note that the boiler also manages the production of hot water.

I brought in 4,6 tonnes last April. Can I hope to last 1 year?

[Christophe]

Well it depends where you are but I think that given what you say in terms of insulation and if you don't heat to 25 ° C it should be enough (even without problem) ...

There are 2 or 3 members who have an ökofen, you can compare with them.

Do a search: https://www.econologie.com/forums/search.php

[Did67]

There are 2 or 3 members who have an ökofen, you can compare with them.

Do a search: https://www.econologie.com/forums/search.php

I am too recent to have reliable data (starting in January 2008).

The difficulty with the pellets is that it is the roller coaster in the silo, impossible to estimate what was used.

Moreover, even if I could "read" the current consumption, your question is also a little "will the winter be long and cold?" - and there, see the humor section ...

All this said: a priori, the answer is yes. You can hope, if if and if ...

[logredudon]

I totally agree with you.

I therefore appeal to granules users for at least 2 or 3 years ....

I am waiting of course other opinions.

[dirk pitt]

if you were with another energy before the granules, it is very easy to know the necessary quantity.
because if nothing has changed in the insulation of the house, the amount of energy it takes to heat it is the same, whether you heat with fuel oil, pellets or pigeon droppings.
the pellet has a calorific value of about 4800kwh / ton (it is about half less than fuel oil)

[logredudon]

As I already said it is a new construction!

[Christophe]

Well in this case you must know your DPE fairly precisely, right? Otherwise contact the contractor who built!

In kWh / year.m² ... you multiply it by the living area and with the 4.8 kWh / kg of pellet you know the mass of pellets needed.

Examples:

a) Your recent house has a coef. DPE de B i.e. 90 kWh EP / year.m² in the worst case (cf https://www.econologie.com/dpe-diagramme ... -3561.html )
b) You will therefore need 90 * 120 = 10 kWh
c) With 4800 kWH per tonne, that's roughly 2.25 Tons.
d) Add 10% to 15% for hot water and you will have a good estimate of your needs, ie 2.6 Tons.

The efficiency of the boiler does not intervene because we reason in EP = Primary Energy

ps: in your place I would quickly install a solar system for the 5-6 months of the summer in order to save your boiler (there is no worse than a wood boiler which turns in partial charge).

This is what Did67 did, you will find other okofen users here: https://www.econologie.com/forums/suivi-du-t ... t6424.html

[dirk pitt]

ps: in your place I would quickly install a solar system for the 5-6 months of the summer in order to save your boiler (there is no worse than a wood boiler which turns in partial charge).

for 5 or 6 months, it will make the solar water heater expensive. I had considered the solution and finally, I have an electric mixed water heater which heats with nuk electricity during the summer.
despite all the good will, when writing the check, we always rest the questions of big money.

[Christophe]

5 to 6 months = exclusive to solar ... the rest is in addition to wood ...

There is a kit (panel + regulator + 300L double exchanger tank + circulator) of 6m² of vacuum tubes (36 tubes I think) for 2500 € at a hard discount brico whose name I will not mention (including 2 large in France ... it's one of the 2) ...

Obviously for this price should not think subsidy (although we never know if you have a heating buddy who wants to mount it to you?) ...

For DIY enthusiasts it is still a good deal ... reliability over time?

[logredudon]

Last thing: A boiler 15 kW is she well proportioned for a house of 120m2?