Ethos 36C User Manual

Installation and Operation manual ETHOS 36C and ETHOS 54C –1511/05-issue1
Page 9
3.8 Ethos resistance table
By using different flue installations, either concentric or the 2 pipe system different flue lengths can be achieved, Up
to a resistance of 150 Pa. At this pressure the heat input will be equal (±5%) to the heat input specified on the data
plate of the appliance. In case a concentric system is used, its length should not exceed 12 meters.
Example of calculation
boiler type: Ethos 54C
Concentric pipe 80/125mm vertical 5m + horizontal 1m=total 6m concentric straight pipe
2x Concentric 90° bend ;
2x Concentric 45° bend ;
Vertical terminal 80/125.
Resistance
Concentric pipe 80/125: 6m 6 x 11,3 67,8 Pa
Concentric 90° bends : 1 pieces 1 x 12,4 12,4 Pa
Concentric 45° bends : 2 pieces 2 x 8,4 16,8 Pa
Vertical terminal 80/125 40 Pa
Total Resistance 137,0 Pa
Total resistance is 137 Pa, so the boiler output is not changed by the resistance (lower than 150 Pa) and total
concentric length is less than maximum allowed 12 meters.
Concentric Flue System (mm) Resistance system [Pa]
Part
ETHOS 36 C
ETHOS 54C
Vertical Terminal 80/125
19 40
Horizontal Terminal 80/125
36 75
straight pipe/m 80/125
5,3 11,3
45° bend 80/125
4,1 8,4
90° bend 80/125
6,1 12,4
Two Pipe System
Air Inlet Part
straight pipe/m 80 1,7 3,4
45° bend R=0,5D 80 2,0 3,8
90° bend R=1,0D 80 3,2 5,8
Flue Gas Outlet
Vertical terminal 80 19 40
Horizontal terminal
80 36 75
straight pipe/m 80 2,1 4,9
45° bend R=0,5D 80 2,5 5,8
90° bend R=1,0D 80 3,9 8,9
Table 3 Flue discharge resistance

Ethos 36C Specifications

General

Brand	Ethos
Model	36C
Category	Boiler
Language	English