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OPERATING PRINCIPLE
The HeatMaster
®
is a high performance, direct fired hot water
storage heater, which has indirect heat transfer due to its Tank-in-
Tank construction.
At the heart of the HeatMaster
®
is a stainless steel cylinder through
which the flue tubes pass. This is surrounded by a mild steel shell
containing the primary water
(neutral fluid)
. The outer shell extends
down to the combustion chamber and even around the flue tubes.
The area of the heat transfer surface is therefore much greater than
that of standard direct fired water heaters.
A circulating pump fitted to the primary circuit moves the water
around the tank, heating it faster and maintaining an even
temperature across the primary jacket.
The burner heats the primary water, which indirectly heats the
stainless steel tank containing the hot water. As in all Tank-in-Tank
systems, the tank is corrugated over its full height and suspended in
the HeatMaster
®
by its hot- and cold water connections.
The cylinder expands and contracts during use and this, together
with the fact that cold water does not come into contact with the
intense heat of the burner flame, means that limescale buildup is
prevented.
This scale resistant feature, along with the corrosion resistance of
stainless steel, eliminates the need for sacrifical anodes.
The HeatMaster
®
has one very major advantage over other direct
fired water heaters - because it heats the DHW with a primary
circuit, this primary water can be used to provide central heating as
well.
By connecting two, three, four or more HeatMaster
®
together in a
module, most hot water and heating demands can be met.
Indeed, when used in conjunction with HR and Jumbo hot water
storage tanks the HeatMaster
®
can supply even the largest hot
water requirement.
Standard equipment
The HeatMaster
®
201 includes the following parts as standard:
- On/off switch
- Summer/Winter switch
- MCBA controller, including
• an electronic controller
• a low-water-level safety device
• a burner modulator
- Primary circulating shunt pump
- Primary expansion vessels
- Primary safety valve
- Pressure and temperature gauge
- Drain valve
- Body completely insulated in rigid polyurethane foam
PACKING
The HeatMaster
®
is delivered in 4 separate packages.
• Package No. 1: Foam-insulated body, hydraulic accessories,
and control panel.
• Package No. 2: Chimney reducing pipe.
• Package No. 3: The jacket.
• Package No. 4: The burner and its cover, the door insulation
and the sealing cord.
4
DESCRIPTION
CONSTRUCTION FEATURES
Outer body
The outer body containing the primary fluid is made of thick STW 22
steel.
TANK-IN-TANK heat exchanger
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 over its full height by an exclusive
production process and entirely argon arc welded by the TIG
(Tungsten Inert Gas) method.
Combustion gas circuit
The combustion gas circuit is paint-protected and comprises:
• Flue pipes
The HeatMaster
®
201 range has 15 steel flue ways with an
inside diameter of 64 mm. Each flue way has turbulators
made of special stainless steel designed to improve the heat
exchange and reduce the flue-gas outlet temperature.
• Combustion chamber
The combustion chamber on HeatMaster
®
models is entirely
water cooled.
Insulation
The boiler body is fully insulated by rigid polyurethane foam with a
high thermal insulation coefficient, sprayed on without the use of
CFCs.
Casing
The boiler is covered by a steel jacket which has been scoured and
phosphated before being stove enamelled at 220°C.
Burner
Models in the 201 range are always delivered with an ACV
BG 2000-M 201 air-gas premix burner.