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Solahart Owner’s Manual – Thermosiphon Systems - Revision 3
Note: The maximum length of 9 m for a drain line is reduced by 1 m for each additional bend of greater than 45°, up to a
maximum of three additional bends. Where the distance from the water heater to the final point of discharge exceeds the
maximum length, the drain line from the valve may discharge into a tundish.
Do not allow water from the valve outlets or drain pipes to drip or discharge onto roofing materials or roof gutters. These
pipes should run to ground level where hot water discharge is safe and clear of any paved areas. Where a drain line crosses
over a metal roof, the pipe work must be fully insulated with weatherproof lagging to offer corrosion protection to the metal
roof against water runoff over the copper pipe. The insulation must be UV resistant if exposed.
Warning:
As the function of the temperature pressure relief valve is to discharge high temperature water under certain
conditions, it is strongly recommended the pipe work downstream of the relief valve be capable of carrying water exceeding
93°C. Failure to observe this precaution may result in damage to pipe work and property.
VENTED SYSTEM CONNECTION
The Vent pipe must be connected to the relief port at the top of the tank. The recommended setup of a vented system is as
shown below:
NOTE
: A vent pipe cannot be used with a pumped water supply or from a pressurized mains water supply.
The recommended specifications for the vent pipe are:
Material: Polymeric Tubing or Copper Tubing
Minimum Internal Diameter 15mm
Vent pipe should extend to 100mm (0.1m) to 300mm (0.3m) above the water surface of the header tank and must be
structurally supported to maintain this height.
HOT WATER OUTLET
The hot water outlet of the water heater is labeled as “HOT OUTLET”. This is a Rp3/4 fitting. Connect hot water delivery line
to this port.
This water heater can deliver water at temperatures which can cause scalding. We recommend that a tempering valve be fitted
to the hot water line to reduce the risk of scalding. Refer to plumbing codes applicable in the area to see if a tempering valve
is required for this installation for the supply of hot water from the solar water heater.
SOLAHART
150L TANK
COLLECTOR
SUPPLY
TANK
MINIMUM HEIGHT
1m
0.1m - 0.3m FROM
MAXIMUM SUPPLY
TANK WATER LEVEL
VENT PIPE
