Student worksheet
Energy efficiency for gas-fired and oil-fired domestic heating and heat water
systems
Session 6
Please work alone to complete the following questions.
Student name:
1. Which of these statements is correct for new systems? (tick one answer)
a) If secondary circulation is used, all pipes kept hot by that circulation
should be insulated only if external to the building
b) If secondary circulation is used, all pipes kept hot by that circulation
should not be insulated
c) If secondary circulation is used, all tap outlets kept hot by that circulation
should be insulated
d) If secondary circulation is used, all pipes kept hot by that circulation
should be insulated.
2. Where the pipe diameter size is 22mm OD, what is the permissible heat
loss (W/m)? (tick one answer)
a) 14.12
b) 6.52
c) 9.12
d) 7.89
Student worksheet
3. What is the minimum distance that all pipes should be insulated to, from
their point of connection to the hot water cylinder in new systems? (tick
one answer)
a) 1 metre
b) 2 metre
c) 0.5 metre
d) 0 metre
4. If you were installing a replacement oil boiler, would you insulate any
exposed pipework as a result of your work? (tick one answer)
a) no
b) if the customer requested it
c) yes
d) if the building is in a cold location
5. Where insulation is labelled as complying with the Domestic Heating
Compliance Guide, it must not exceed the maximum permissible heat
loss (W/m) level for pipework with outside diameter of:
(please complete the figures below)

10mm - ………W/m

15mm - ………W/m

22mm - ………W/m

28mm - ………W/m
Student worksheet
6. Where would you find additional guidance for insulation of heating and
hot water pipework in unheated areas against freezing? (tick one answer)
a) BS 3677:2002
b) BRE no 262:2002
c) BS 5422:2009
d) MER no 299:1979