Baxi Solarflo User Manual page 3

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Solarflo - Solar Thermal Domestic Hot Water System
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2.0 Baxi Solarflo Description
Your Baxi Solarflo system consists of several component
parts that work together to heat your domestic hot
water supply either from the power of the sun, by
conventional means (by a boiler or electric immersion
heaters) or combination of both.
This combination is required because the sun's energy is
not uniformly received throughout the year (some 70%
of the UK's annual radiation is received over the period
April to September).The amount of sunshine hours will
vary and the proportion of direct radiation (from a clear
sunny day) and diffuse radiation (from partly cloudy or
overcast skies) will also vary. However, on average up to
60% of a dwellings annual hot water requirement can be
provided by a solar water heating system.The balance is
provided by the auxiliary heating source.
Fig 1 shows the main component parts of the Baxi
Solarflo System.
1 Solar panel
(Note: larger cylinders may have 2 or 3 panels connected)
2 Solar Hydraulic Station
3 Solar Differential Temperature controller
(Note: May be mounted remotely from Hydraulic Station)
4 Solar Expansion Vessel
5 Solar Cylinder
6 Auxiliary Boiler
(Note: Auxiliary heating may be by immersion heaters)
7 Solar Cylinder cold water controls
(Note: May not be fitted if using a cistern fed vented
cylinder)
8 Thermostatic blending valve
9 Balanced cold water supply
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