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	LCD display, arced power indicator, constantly displays water temperature and/or malfunction and power status of combustion. Easy and convenience operation, temperature adjustment for winter heating and shower.
	Comfortable heating supply and suitable hygienic hot water supply are combined into the boiler.
	Safe and reliable: There is 18-safety protection function of the boiler, such as automatic protection against extra-low and extra-high air pressure, electrical voltage and water temperature, automatic anti-freezing function, automatic anti-lock function against locks, automatic inspection of safety functions. All the functions completely eliminate the hidden troubles.
	Energy saving and environmental protection: the compustion is adjusted automatically and proportionally.
	The newest anti-dirty secondary heat exchanger, which ensures the heat efficiency and increases the life time of the boiler greatly.
	DD18-B1(18KW) and DD24-B1(24KW) models have 2 heat exchangers, while DP18-B1(18KW) and DP24-B1(24KW) models have 1 heat exchanger.

TECHNICAL PARAMETERS
HEATING SYSTEM
product model	DD24-B1, DP24-B1/DD18-B1, DP18-B1 UNIT
gas type	natural gas, LPG & town gas
rated input capacity	26.3	20	kW
rated output capacity	23.7	18	kW
min. input capacity for heating	11.2	8.5	kW
min. output capacity for heating	9.3	7.1	kW
min. input capacity for hot water	9.8	7.5	kW
min. output capacity for hot water	8.1	6.2	kW
efficiency	90.1	90.1	%
working pressure of heating system	0.05-0.3	0.05-0.3	MPa
max. heating water temperature	90	90	⁰C
adjustment range of heating water temperature	40-85	40-85	⁰C
power supply	220-50	220-50	volt/Hz
rated electric power	125	125	W
degree of electrical protection	x 4D	x 4D	IP
expansion tank volume	8	8	L
expansion tank preload	0.1	0.1	MPa
heating area	60-200	60-150	m²
reference gas consumption (natural gas)	1.23-2.60	0.94-2.1	m³/h
reference gas consumption (LPG)	1.00-2.10	0.75-1.56	m³/h
net weight	38	36	kg
dimensions	(L) 403mm, (P)325mm, (H)725mm
DOMESTIC HOT WATER SYSTEM
max. working pressure	0.6	0.6	MPa
min. working pressure	0.03	0.03	MPa
hot water capacity Dt = 25⁰ C	13.6	10.3	L/min
hot water temperature adjustment range (+/-3⁰C)	35-60	35-60	⁰C
min. hot water flow for starting	2.5	2.5	L/min
limited flux	10	7.3	L/min
RATED GAS PRESSURE
natural gas	2000	2000	Pa
liquid petroleum gas (LPG)	2800	2800	Pa
town gas	1000	1000	Pa
CONNECTION DIMENSIONS
heating system: water inlet & outlet	3/4"	3/4"	dia
domestic hot water system: water inlet & outlet	1/2"	1/2"	dia
gas system: gas inlet	3/4"	3/4"	dia

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