Given all the systems out there the best option is to keep the
selection as simple by following three rules:
The best kept secret in the business comes back to the "Keep
It Simple Stupid" policy which will simplify the system selection.
No doubt you'll be in this venture to make a profit and the more
simple the better at first. For that reason we recommend a
system that meets the layout of this
System Diagram using a
Rheem Solaraid HE dual purpose tank in either 80
or 120 gallon sizing.
Solar Collector (SC)
From the completed Site Survey Data Worksheet input the
manufacturer's stated Solar Collector Efficiency % in cell B21.
If the manufacturer has not stated an efficiency number use 35%.
Solar Collector Square Footage cell B64 will provide the minimal
square footage required.
Most kits will be provisioned
incrementally, usually a 4 person or 6 person size. It's OK to
be a little undersized as this will affect the Solar Water Heating
Percentage factor that you'll have to manually change. In this
event you'll need to run some scenarios on under sizing or over
sizing to evaluate the system cost against the return on investment.
A good rule of thumb is to stay within 75%-100% Solar Water Heating
Storage Tank (ST)
Whether you choose a single purpose storage tank or a dual purpose
tank, you'll need to match it to the storage size required.
Recall the point about 24 hour cycle sizing from
Section 401 - unless you're
designing a system for a weekend retreat, follow the 24 hour cycle.
Rheem Solaraid HE
Closed Loop System (CL)
Most systems only require a single Closed Loop Pump, although when
the run is greater then 200 feet round trip, a second pump is
beneficial. Choose whatever power system will best fit the
application, 120VAC or Solar DC.
Simple controllers tend to work the best. Solar powered system
controllers sometimes require battery back-ups which may be a
service element your customer won't want to deal with.
Valves & Expansion Tank (VE)
- Air Vent
- Pressure Relief Valve
- Floating Ball Check Valve
- Loop Charge Valve
- Loop Drain Valve
- Loop Bypass Valve
- (2) Temperature Gauges
- Bourdon Tube Pressure Gauge 0-10 PSI
- Expansion Tank
The system will require all of these components fitted to the
Closed Loop plumbing. Depending on the kit you may need to
provision these separately.
Installer Related Materials (IRM)
This will include mounting hardware, stilts and plumbing.
Mounting hardware and stilts are best purchased from the kit
wholesaler sometimes they are included in the kit, sometimes
purchased separately. You will need to specify the type of
roof or host surface to be mounted on.
Plumbing and insulation
will be provisioned as package by you; the package will
contain surplus material to be replenished when the installation
is complete to be ready for the next installation.