Main System 28HE Boiler & Flue

Boiler only code

5120040

5120988

5119353

Adjustable CH temperature

Yes

Yes

Yes

Operating mode selector switch

Yes

Yes

Yes

LED operating / fault status display

Yes

Yes

Yes

Natural Gas

Yes

Yes

Yes

Optional LPG conversion kit

Yes

Yes

Yes

Inlet supply pressure (Natural Gas)

mbar

20

20

20

Inlet supply pressure (Propane)

mbar

37

37

37

Gas rate

m

1.98

2.62

3.06

Heat input (maximum)

kW

18.7

24.8

28.9

Heat input (minimum)

kW

10.6

10.6

11.9

Heat output (maximum) non-condensing

kW

18

24

28

Heat output (minimum) non-condensing

kW

9.9

9.8

11

Heat output (maximum) condensing

kW

18.9

25.2

29.3

Heat output (minimum) condensing

kW

10.2

10.1

11.3

Seasonal efficiency band

SEDBUK

B

B

B

NO

Class

3

3

3

Electrical supply

Volts/Hz

230 / 50

230 / 50

230 / 50

Power consumption

Watts

140

170

180

External fuse rating

Amps

3

3

3

Ingress protection rating

IPX5D

IPX5D

IPX5D

Pump overrun

Yes

Yes

Yes

24hr pump exercise

Yes

Yes

Yes

Integral frost thermostat (boiler protection only)

Yes

Yes

Yes

Maximum installation lift weight

kg

38.5

40.5

40.5

Safety pressure discharge bar

3

3

3

Integral automatic bypass

Yes

Yes

Yes

CH system capacity (maximum)

litres

125

125

125

Gas supply pipe size

mm

22

22

22

Flow & return pipe size

mm

22

22

22

Condensate drain connection

mm

21.5

21.5

21.5

Temporary filling loop

Optional

Optional

Optional

Compartment ventilation required

No

No

No

Pre-plumbing jig

Standard

Standard

Standard

Standard concentric flue diameter

mm

100

100

100

Standard flue installed length

mm

685

685

685

Maximum equivalent length horizontal

m

5

4

3

Maximum equivalent length vertical

m

5

4

3

Optional twin pipe vertical flue diameter

mm

80 / 80

80 / 80

80 / 80

Maximum equivalent length vertical terminal

m

10

12

12

PDK Maximum equivalent length vertical

m

3.5

2.5

2.5