Gas Boilers of Prime-ST Series

Prime-ST double-pressure water-heating outdoor gas heating boiler is a heat generator producing heat by natural or liquefied gas combustion. It is designed for operation in cold temperate climate areas with ambient temperatures of -25°С to +45°С (location category 1 (outdoors) per GOST 15150-69). The boiler is intended for heating and hot water supply systems of households, cottages, and office buildings with forced coolant circulation water heating systems and forced exhaust of combustion products via coaxial flues.

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Description

Description

Boiler installation requires no compliance with gas inspectorate regulations for boiler rooms

No ventilation required

No separate boiler room required

Occupies no inner space

Maximum efficiency 92.5%

Equipped with gas leakage control system, and shutoff valve

Thermal shutoff safety valve in the gas trunk line

Active standby interior electric heating system

Automatic ventilation system for hot climate

Individual automatic safety circuit breakers

Optional GSM module installation

The supply package includes the coaxial flue and surface mounting base

Ambient operation temperatures of -25°C to +45°C

Optional connection of remote interior comfort monitoring and control devices (Android and IOS) using the integrated ModBus protocol or relay-type contacts

Gas pressure loss adaptation

Intuitive controls

Highly harmonized assemblies and components for all models of wall-mounted Lemax boilers

Optional connection of room thermostats for high-precision interior temperature control

Solid 50mm thick heat and sound proofing ensures acoustic comfort and maintains the temperature inside the boiler body

The increased-volume combustion chamber ensures complete gas combustion, extends the heat exchanger service life, and minimizes gas consumption

The integrated pressure transducer and relief valve ensure two-tier protection against excessive heating circuit pressure

In most situations, the operation in systems with high hydraulic resistances eliminates the need for extra pump installation

Transducer and sensor structures are protected against corrosion and scaling

The extended range of the boiler operating voltage ensures stable operation in electric grids with increased and reduced voltages (185 to 245V)

The integrated ignition transformer ensures stable sparking and the smoothest ignition

The LCD screen water pressure indicator ensures user-friendly monitoring of water pressure

The independent heat exchanger of the hot water supply circuit minimizes the annual maintenance costs, ensures stable temperature of the hot water supply circuit, and boasts a longer service life versus bi-thermal heat exchangersThe flow sensor starts up the hot water supply circuit at water flows of 2 liters per minute and cuts off at water flow of 1.5 liters per minute to allow using the hot water supply circuit under low water pressure conditions

The hydraulic group of the boiler has a bypass for protecting the boiler elements against overheating in case of excessive hydraulic resistance in the heating system

The detachably mounted lining ensures easy maintenance of the boiler

Liquefied gas usage option

Parameters	Prime‑ST10 / Prime‑ST10 HO	Prime‑ST12 / Prime‑ST12 HO	Prime‑ST14 / Prime‑ST14 HO	Prime‑ST16 / Prime‑ST16 HO	Prime‑ST18 / Prime‑ST18 HO	Prime‑ST20 / Prime‑ST20 HO	Prime‑ST22 / Prime‑ST22 HO	Prime‑ST24 / Prime‑ST24 HO	Prime‑ST26 / Prime‑ST26 HO	Prime‑ST28 / Prime‑ST28 HO	Prime‑ST32 / Prime‑ST32 HO
Combustion Chamber Type	closed	closed	closed	closed	closed	closed	closed	closed	closed	closed	closed
Automatic Safety Controls	845 SIGMA	845 SIGMA	845 SIGMA	845 SIGMA	845 SIGMA	845 SIGMA	845 SIGMA	845 SIGMA	845 SIGMA	845 SIGMA	845 SIGMA
Rated Heat Capacity Supply in the Heating Mode, kW	10	12	14	16	18	20	22	24	26	28	32
Minimum Heat Capacity Supply in the Heating Mode, kW	6	6	6	6	6	9	9	9	11	11	11
Efficiency, %, max.	92*	92*	92*	92.5*	92.5*	92.5*	92.5*	92.5*	92.2*	92.2*	92.2*
Reference Heated Space Area, sq.m	100**	120**	140**	160**	180**	200**	220**	240**	260**	280**	320**
Expansion Tank Volume, l	6	6	6	6	6	6	6	6	6	8	8
Natural Gas Consumption, cu.m/hr
– max.	1.13	1.36	1.59	1.81	2.04	2.27	2.50	2.72	2.95	3.17	3.63
– mean	0.6***	0.7***	0.9***	1***	1.2***	1.3***	1.35***	1.4***	1.5***	1.7***	2***
Rated Natural Gas Pressure, Pa	1300 to 2000	1300 to 2000	1300 to 2000	1300 to 2000	1300 to 2000	1300 to 2000	1300 to 2000	1300 to 2000	1300 to 2000	1300 to 2000	1300 to 2000
Rated Liquefied Gas Pressure, Pa	2900	2900	2900	2900	2900	2900	2900	2900	2900	2900	2900
Maximum Operating Coolant Pressure, MPa	0.3****	0.3****	0.3****	0.3****	0.3****	0.3****	0.3****	0.3****	0.3****	0.3****	0.3****
Minimum Operating Coolant Pressure, MPa	0.08****	0.08****	0.08****	0.08****	0.08****	0.08****	0.08****	0.08****	0.08****	0.08****	0.08****
Expansion Tank Precharge Air Pressure, MPa	0.1	0.1	0.1	0.1	0.1	0.1	0.1	0.1	0.1	0.1	0.1
Unit Hot Water Consumption at ΔT=25°C, l/min	9.7******/-	9.7******/-	9.7******/-	9.7******/-	9.7******/-	13.1******/-	13.1******/-	13.1******/-	18.1******/-	18.1******/-	18.1******/-
Combustion Products Temperature, °C, min.	80	80	80	80	80	80	80	80	80	83	80
Electric Power Supply Parameters, V/Hz	220/50	220/50	220/50	220/50	220/50	220/50	220/50	220/50	220/50	220/50	220/50
Maximum Electric Power Consumption, W	650	650	650	650	650	650	650	650	650	650	650
Dimensions, mm — height	1530	1530	1530	1530	1530	1530	1530	1530	1530	1530	1530
Dimensions, mm — width	850	850	850	850	850	850	850	850	850	850	850
Dimensions, mm — depth	690	690	690	690	690	690	690	690	760	760	760
Weight, kg, max. — net	130	130	130	130	130	130	130	130	135	135	135
Weight, kg, max. — gross	145	145	145	145	145	145	145	145	150	150	150

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