Boiler Efficiency - from non-condensing boilers
to condensing boilers:
From 2005 all new boilers installed in the UK have to be
condensing type, ie, high efficiency at up to 92%, or called A
rated, compared with casting iron type boilers which is
only around 55% in efficiency. A high efficiency boiler
will save you gas consumption in the long run.
Heating controls or hot water controls:
energy used for heating is more than half of the total
household energy required. A higher efficiency by a
modern boiler could be achieved by running it at
condensing mode while it is on the heating demand.
One of the easiest ways of reducing your gas bill is to
use the system in such a way that it doesn't heat the
house unnecessarily, or put such a strain on the boiler
that it is wasteful.
On/OFF room thermostats (ErP class I):
These are your typical wall thermostats and programmers
that most people in the UK are used to. They are the
absolute minimum standard of control set in the UK, and
because of this, the vastly most installed. The pit fall
of these controls are that they do not make enough use
out of condensing gas boilers potential efficiency.
However they do have their place, where the heat
producing appliance does not benefit from operation at
low temperatures, the property has low occupancy, and
the usage pattern of the house is regular, however even
then there may be benefits to using more intelligent
TPI room thermostats (ErP class IV):
TPI (Time Proportional & Integral) control is an
industry standard term for an On/Off control using an
advanced energy saving control method that can be used
by most heating systems. The controls simply switch
current supplied to the boiler on or off at different
times. Unlike a traditional thermostat, these rely on
digital technology that matches the boiler firing to the
load on the system.
In our opinion, TPI controls for heating are a minimum
with a boiler new install or upgrade for extra energy
saving and confortable room temperature controls.
Modulating controls by OpenTherm (ErP
OpenTherm is a communication protocol in which sensors
can provide live feed back to the boiler so it can
modulate according to load, this gives a very responsive
system but if not set up correctly at the expense of its
maximum potential efficiency.
OpenTherm thermostats need boilers to be OpenTherm
compatible. Viessmann, Baxi, Ideal and Intergas are all
OpenTherm compatible, but Vaillant and Worcester have
their own smart controls, not directly compatible with
Modulating controls by weather compensation (ErP
Weather compensation controls enable a condensing boiler
to work at its optimum efficiency. The controls allow
the boiler to vary its operating flow temperature
automatically, day by day to suit the weather outside
and the temperatures inside the house, rather than
heating up, overheating and turning off again (i.e.
Weather compensation works with
a sensor outside and another in the boiler which
continuously communicate with each other and vary the
boiler’s flow temperature, rather than continuously
turning the boiler on and off and wasting energy. The
aim is to keep the temperature as low as possible so the
boiler condenses for virtually all of its operating
period. To get the most from weather compensation,
radiator sizing and condensing theory are essential to
Related Products (ErP) explained here
UK official web site:
Nest review (2G):
Nest 2G is ErP class IV (TPI) and Nest 3G is ErP class
IV (TPI) or ErP class V (OpenTherm), ie, they are not
only giving comfortable and accurate room temperature
control but also archive energy saving.
We offer Nest room thermostat installation with new
boiler installation. The materials are £179 (Nest 2G)
and £199 (Nest 3G) and we
charge £70 for installation labour (Nest 2G) and £90 for
Nest 3G, both plus £10 materials.
We are a Nest official approved installer!
Remote control of your home is now
a fashion! Since Nest, there have been some internet
thermostat models developed by British Gas (Hive), and
by independent controller make like Honeywell, or by
boiler manufacturers like Vaillant (vSMART) and
Worcester (Wave). Among them we still believe Nest is
the best. It is made for purpose, massively produced
worldwide, and has a very few call
We are probably the only boiler installation firm in St
Albans with NICEIC electrician qualification, so we are
competent on electrical controls for boilers and central
The only question for customer is, what is type of your
existing room thermostat, wired or wireless one? If it
is wired, your new Nest install only need Nest
otherwise if your current stat is wireless one or you
don't have a wired room stat now, you also need buy
an extra Nest Stand at £29.
Honeywell Lyric T6/T6R installation:
T6/T6R is another good smart control from Honeywell which,
as Nest 3G, is classified as class
IV (TPI) or ErP class V (OpenTherm).
Lyric T6 is a wired model to replace an existing wall
mount room thermostat.
Lyric T6R is a wireless model to suit there isn't a
wired room stat to replace, so new Lyric can be put on a
coffee table or on a TV stand.
We charge £90 labour plus £10 materials for a Lyric
Hive installation (ErP
was developed by British Gas, but you can buy them and
install them on their own.
Hive is similar to Nest and can control both heating and
hot water, either by manual dial adjustment or via the
internet by smart phones remotely.
The only difference is Hive has a lower energy
efficiency rate, it is still ErP class I, the same as an
on-off thermostat, in contrast to Nest which is class
We charge £90 labour plus £10 materials for a Hive
Mobile: 07944 168888 / Email:
Telephone: 01727 537688 /
Fax: 01727 537689
Address: 77 Batchwood
Drive, St Albans, Herts, AL3 5UF