The system D Heat Bank Thermal Store represents the most popular unit in our range for new-build installations, fitted with all the controls needed to provide mains pressure hot water, as well as the full array of sealed primary system controls.

1. Feed and expansion tank (to service thermal store only)
2. Mains feed to ball valve
4. Overflow connection
10. Automatic air vent
11. Y-pattern strainer
14. Heat exchanger pump
15. Manual air vent
18. Cold feed / expansion
19. 3kW backup incaloy immersion heater
22. Thermostatic blending valve
23. Cold mains in
24. Hot mains supply to outlets
25. Flow switch
26. Drain-off cock
28. Plate heat exchanger
31. 3-port motorised mid-position valve
32. Primary circulating pump
33. Flow from boiler
34. Cylinder thermostat
36. Flow to primary coil
38. Return from primary coil
39. Balancing valve
46. 8 litre primary expansion vessel
58. Electronic programmer
59. Y-plan wiring centre with individual terminals for every wire
60. Primary filling point with check valve
61. Filling loop
62. 1/2" pressure relief valve with pressure gauge
64. Isolating lever valve
67. Room thermostat

The drive behind the design of the System D Heat Bank Thermal Store is to provide house-builders with:

	A high performance hot water system requiring NO COLD WATER STORAGE.
	A reliable sealed primary system, requiring no feed & expansion tanks.
	Pre-fabricated pipework, controls & wiring to reduce on site labour requirements.
	A fully tested system to cut down 'making-good' times on the installation.
	The ability to specify system controls without the need to train installers on the specifics of the installation of those controls.
	The peace of mind that the hot water system has been developed over a long period in conjunction with the best design offices the building industry has to offer.

Primary System Layout
Domestic Hot Water Controls not shown