> 2 suauge, 2 vaikai, vandens 14-15 m3/men - 30-35m3 duju. pasildymas 
> momentinis.
> 
> Tavo duju suvartojimas atrodo per didelis. Gal nustates labai auksta karsto 
> vandens temp.?


O jei rimtai.. cia didelis, ar tik atrodo didelis?

https://en.wikipedia.org/wiki/Heat_of_combustion#Higher_heating_values_of_natural_gases_from_various_sources
38,23 MJ/m3 = 38,23/4,1868 = 9131,08 kcal/m3 [HHV] = 9,1 Mcal/m3
The lower heating value of natural gas is normally about 90 percent of its higher heating val.
Tai tie ~8000 kcal yra LHV = 8 Mcal/m3

Centrinio sildymo info:
Šilumos kiekis, priskirtas 296,002 m3 
geriamam vandeniui šildyti, 15889,394 kWh
1m3_pasildymui_iki_karsto = 53,68 kWh/m3

1 kWh = 0,8598 Mcal
53,68 kWh = 46,15 Mcal

 1 cal  = 1g  +1*C
 1 Mcal = 1m3 +1*C
46,15 Mcal = 1m3 + 46*C