OVERVIEW
• Combination boiler
(central heating and domestic hot water)
.
• TANK-IN-TANK indirect storage type domestic hot water production.
• The central heating connections are designed so that they can be
connected in all three directions, this means that the boiler can be
installed against a wall or in a corner without having to leave any
free space
(see page 6)
.
• Internal two-stage temperature control thermostat, which allows
the power to be adapted according to actual heat requirements.
• The boiler is fitted with expansion tanks, a safety valve, a
mano-thermometer, a water low safety device
(pressure switch)
and
a circulation pump.
OPERATING PRINCIPLE
The TANK-IN-TANK concept
The Etech’s series differs from traditional hot water producers in that
it has a tank immersed in the primary fluid contained in the outer
body. When there is a temperature drop in the boiler because the
central heating system or the domestic hot water circuit needs hot
water, the internal thermostat starts up the power on the immersed
electrical resistors. The heating elements quickly heat up the primary
fluid, thus creating a natural circulation around the tank.
Indirectly heating domestic hot water
This circulation allows easier heat exchange between the primary
fluid and the domestic water, all over the tank surface. The corrugations
on the outer shell of the tank increase the area of heat exchange still
further and thus speed up the process of heating the domestic
water.
Easy to set
With a single command, the water temperature of both the primary
circuit and the domestic hot water circuit can be set by the adjustable
thermostat situated underneath the tank in the primary circuit.
2
DESCRIPTION
CONSTRUCTION FEAURES
Outer body
The outer body containing the primary fluid is made of thick STW 22
steel.
TANK-IN-TANK type exchanger accumulator
The ring-shaped inner tank with its large heating surface for
producing domestic hot water is built of Chrome/Nickel 18/10
stainless steel. It is corrugated ocer its full height by an exclusive
production process and entirely argon arc welded by the TIG
(Tungsten Inert Gas) method.
Isulation
The boiler body is fully insulated by rigid polyurethane foam, with a
thickness of 70mm, with a high thermal insulation coefficient. This is
sprayed onto the tank without using any CFCs.
Casing
The boiler is covered by a steel jacket which has been scoured and
phosphated before being stove enamelled at 220 °C.
Heating elements
nding on the model, the boiler is fitted with either six or seven
etachable stainless steel AISI 304L immersion heaters.
Controller
Control
thermostat
ON/OFF
switch
Power
selection
switch
Summer/Winter
selector switch
Combined temperature
and pressure gauge
Power
selection
switch
Safety
indicator
light
Safety
thermostat
Control panel
