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Insulation resistance of the electric heater
During the first use of the heater the insulation resistance of the heating element might
prove to be temporarily lower than the standard. The reason for that is the moisture
seeped into the insulating layer during storage in the warehouse and transportation.
The moisture evaporates in 1–2 hours of heating the electric heater.
Laying of the heater stones
• HUUM DROP electric heater requires approximately 121.3 lbs (55kg) of stones.
• The stones with a diameter of 2-4 in (5–10 cm) are suitable for
HUUM DROP heater.
• We recommend the use of round stones which complement the design of the
heater and allow the water in the heater to move freely to the lower layers of
stones.
• Natural stones (e.g. olivine diabase, olivine), which are sold specifically for use in
sauna heaters, are suitable as heater stones.
• We recommend avoiding decorative stones as they do not accumulate enough
heat and break easily. Broken pieces of stone inside the heater can block air
holes and damage heating elements.
ATTENTION!
not covered by warranty.
• Before laying, we recommend washing the stones clean of dust under running
water.
Requirements for laying stones:
• Use gloves to protect your hands when laying stones.
• Lay the stones one by one and don't pour or throw them into the heater.
• Start with bigger stones, placing them to the bottom and to the sides. Use
smaller stones to fix the larger stones in place and to fill in the narrower gaps.
• Try to lay the stones as tightly as possible, but leave some room for air to
circulate in the heater.
• Lay the stones between the heating elements as well. This will help support the
heating elements and prevent them from coming into contact. Take care not to
push the stones too hard or bend the heating elements.
• Lay the outer surfaces of the heater tightly and make sure that the heating elements
are not visible through the stones. Ladling water directly onto the heating
elements shortens their lifespan and produces an excessively sharp heat.
ATTENTION!
stones, the safety distances given in Table 1 do not apply, as additional
heat radiation to flammable surfaces will occur. Make sure that the heating
elements are not visible from between the stones!
• Check the condition of the stones once a year to remove broken pieces and
replace them, if necessary.
8
The defects due to the use of unsuitable stones are
If the heating elements are not properly surrounded by
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