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ESP400-10-200L and 300L
Whilst secondary returns do make for greater comfort by having hot water immediately available at taps, it is an
energy sapping facility – it is recommended that all secondary returns should be fitted with timers so that
circulation is not constant.
PLEASE NOTE: All secondary return pipework MUST be very well insulated and, even then,
may have a very detrimental impact upon the economics of generating hot water.
6.9 Temperature and Pressure Relief Valve (“TPRV”):
The TPRV is factory fitted and must not be interfered with in any way and/or removed - under NO
circumstances should the installer or end user tamper with the TPRV or the warranty/guarantee for
the unit will be invalidated and serious damage may result. If the TPRV fails it should only be
replaced by a qualified installer under the following regulations –
G3 (ENGLAND AND WALES), TECHNICAL STANDARD P3 (SCOTLAND) OR BUILDING
REGULATION P5 (NORTHERN IRELAND) AND THE WATER FITTING REGULATIONS
(ENGLAND AND WALES) OR WATER BYELAWS (SCOTLAND).
6.10 Warnings:
i) Under no circumstances should the factory fitted TPRV be removed other than by
approved, fully trained and experienced fitters. To do so will invalidate any
warranty/guarantee or claim.
ii) The Cold Water Combination Valve, in line strainer and scale inhibiting device must be
fitted to the mains water supply to the unit.
iii) No control or safety valves should be tampered with.
iv) Water may drip from the discharge pipe of the TPRV and this pipe must be left open to
atmosphere. The discharge pipe should not be blocked or used for any other purpose.