Installation manual

4
PROPERTY OWNER’S RESPONSIBILITY
Twin Flow in Domestic Properties.
Any domestic heating and hot water system must be subject to an annual service. All gas
appliances must be serviced by a competent person.
Twin Flow in Commercial and Rented Properties.
If the property is to be used as a commercial premise, including landlord’s rented
accommodation, then there is a duty of care to protect employees, tenants, and the public
from the possible dangers of hot water systems including scalding and Legionella. Although
this document is not intended to give expert advice on ways to avoid these issues it can
serve as a guideline to what should be done and where more information can be found. The
full list of responsibilities can be found in the following documents
TM13 CIBSE: Minimising the Risk of Legionnaires Disease
ACOP L8: The Control of Legionella Bacteria in Water Systems
HSE publication: Legionnaires Disease: A guide for employers
Various other documents that are industry specific such as
HSE publication: Controlling Legionella in Nursing and Residential Homes
NHS Estates HTM 2040 The Control of Legionella in Healthcare Premises: a code of
practice.
and HTM 2027 Hot and Cold Water Supply, Storage and Mains Services.
There are many industry specific documents regarding the distribution of hot water. These
can be found in
IP 14/03 from the BRE: Preventing Hot Water Scalding In Bathrooms: Using TMVs
This list is not comprehensive.
The responsibilities, relative to the Rinnai Twin Flow type of heating and hot water system,
can be summarised in the following way.
1. If used, a secondary return should be set to 60
0
C or higher and must return at over 50
0
C.
The water at the furthest outlets must reach 50
0
C within 60 seconds.
2. Warning signs should be placed over taps where the temperature could exceed 55
0
C.
Where people are at high risk consider thermostatic mixing valves.
3. A risk assessment should be carried out, by a suitably qualified person, to gauge the
associated risk of the hot water system. This assessment should be reviewed at regular
intervals.
4. Based on this assessment a maintenance regime should be determined.
The Twin Flow system must be serviced and checked for safety annually. This alone
is not sufficient. Some parts of the hot water system, such as rarely used shower
heads or terminal fittings, may require frequent maintenance. Frequent checks should
be carried out to ensure the hot water system is operating correctly.
5. The system must be commissioned by a qualified person.
Your Installer’s details:
Commissioning/ Service Engineers Details: