Hot Water Boilers

Thermal and Pressure Engineering range of boilers employ a well tried and proven design concept based on the reverse flame combustion technology pioneered in hot water boilers by Thermal and Pressure Engineering. This reverse flame combustion method provides an economical and highly efficient three pass gas flow system. The design incorporates a large pressurized combustion chamber allowing the first two passes of gas to be made in the combustion chamber itself. The scrubbing action of the reversing flame causes the gases to enter and re-enter the high temperature flame zone many times before making the third and final pass through the smoke tubes. Dimples in the smoke tubes further slow the passage of the combustion gases providing additional efficient heat transfer.

A major criteria in this design is the careful balance between radiant heating surfaces and secondary convection heating surfaces to ensure optimum efficiency when firing either gas or oil.

Because of the use of a pressurized combustion system the boiler operation is completely independent of chimney draught. Chimney sizes are therefore reduced with consequent installation savings.

An extremely easy to clean design as all heating surfaces can be reached easily by opening the burner door. This boiler can be cleaned while hot and still in service completely eliminating the need to shut down the system. An important feature of continued efficient operation, as each millimetre of soot or fouling reduces efficiency by 7%.

Wet back construction with insulated firing door for maximum heat retention to reduce the possibility of condensation in the combustion chamber.

A completely demountable casing system which is easily mounted on the framework forming a permanent part of the boiler.

The boiler top casing is strengthened and braced. The top section is constructed of heavy chequer plate and can serve as a walkway overcoming the most common on site damage problem.

Features:

Standard Features	Optional Features
ON/OFF Switch	Digital Return
Digital Flow	Temperature Indication
Temperature Indication	Flue Gas Temperature Indication
Control and High Limit – (<HWB500)	Modulating Control
Thermostats	Low Water
High/Low Thermostat – (<HWB500)	Cut Out and Indication
Indication Lights	High or Low Gas
Power On	Pressure Indication
High Limit	Time Clock
Lock Out
High Fire
Low Fire

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Technical Data

Model	Output	Dimensions (mm)
HWB	kW	A	B	C	D	E	F	G	H	J
HWB100	100	770	1780	905	400	680	720	120	75	475
HWB125	125	770	1780	905	400	680	720	120	75	475
HWB150	150	770	1780	905	400	680	720	120	75	475
HWB175	175	770	1780	905	400	680	720	120	75	475
HWB200	200	930	1850	1065	400	750	870	120	85	555
HWB250	250	930	1850	1065	400	750	870	120	85	555
HWB300	300	930	1850	1065	400	750	870	120	85	555
HWB350	350	930	1850	1065	400	750	870	120	85	555
HWB400	400	930	1850	1065	400	750	870	120	85	555
HWB500	500	1040	2082	1175	400	982	955	140	95	610
HWB600	600	1040	2082	1175	400	982	955	140	95	610
HWB800	800	1200	2172	1350	500	922	1105	140	105	705
HWB1000	1000	1240	2386	1390	500	1136	1120	140	105	725
HWB1200	1200	1350	2386	1500	500	1136	1205	175	125	780
HWB1500	1500	1485	2490	1640	500	1240	1320	175	125	860
HWB1800	1800	1660	2800	1800	500	1650	1360	175	125	940
HWB2100	2100	1850	3280	2000	500	2000	1550	175	175	1045
HWB2500	2500	1850	3550	2000	500	2294	1550	175	175	1045
HWB3000	3000	2150	4000	2300	500	2750	1900	175	175	1200

Model	Connections (mm)			Dry Weight	Water Content	Fuel Consumption
HWB	Flow & Return	Safety Vent	Flue OD	kg	litres	GAS mj/hr	OIL l/hr
HWB100	65	20	150	445	330	430	12
HWB125	65	20	150	465	322	537	14
HWB150	65	20	180	485	316	645	18
HWB175	65	20	180	504	312	753	20
HWB200	65	25	200	650	450	860	25
HWB250	65	32	200	680	440	1075	28
HWB300	80	32	200	765	420	1290	35
HWB350	80	32	200	780	410	1505	41
HWB400	80	32	20	790	400	1670	46
HWB500	100	40	250	1000	500	2150	58
HWB600	100	40	250	1260	630	2580	70
HWB800	125	50	300	1500	725	3225	87
HWB1000	125	50	350	1796	912	4085	113
HWB1200	125	2x40	400	2054	1170	5160	143
HWB1500	150	2x40	450	2952	1570	6450	179
HWB1800	150	2x50	450	3400	1890	7740	215
HWB2100	150	2x50	500	4200	2200	9030	250
HWB2500	200	2x65	600	4450	2630	10750	299
HWB3000	200	2x65	600	5780	3150	12900	350

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