ECONOMY &
HIGH PERFORMANCE

Buffer Tanks

HOWAT
Enamelled

GLASS + UV

Available in capacities ranging from 50 to 100 liters, these units feature a glass-enamel lining and include supports for either wall-mounted or floor-standing installation. Furthermore, they are equipped with a port for an electric heating element, should you deem it necessary.

Available in capacities ranging from 50 to 100 liters (enamel-lined) and from 160 to 1000 liters, featuring one or two heat exchangers, allowing for easy integration into any type of system (boilers, solar collectors, or a combination of both).

Technical Specifications

50-100 Lt

Glass+UV

HOWAT buffer tanks are the ideal solution for optimizing the performance of a heating system, ensuring greater economy and efficiency. They are connected in series with the boiler—whether it is an oil or natural gas boiler, or a heat pump—or with solar collectors. The unit features dense polyurethane thermal insulation to minimize heat loss, while multiple connection ports offer flexibility for hydraulic piping. These tanks facilitate the storage of hot water while the heating system is in operation, ensuring that a volume of heated water remains available whenever it is needed.

Buffer GLASS + UV
Model 50 Lt 60 Lt 80 Lt 100 Lt
Outer diameter (mm) 415 470 470 470
Height (mm) 745 660 910 1010
Weight (kg) 21.5 22 28 31.5
Inner container material Enamelled DC01 steel
Outer casing Pre-painted sheet metal 0.45mm RAL 9006
Insulation material / thickness polyurethane / 50mm
Inlet socket 1-1/4”, 2 female-threaded outlets
Outlet sockets 1-1/4”, 2 female-threaded outlets
Provision for drainage 1/2”, 1 female-threaded connection
Ventilation port 3/4”, 1 male-threaded connection
Electric heating element socket 1-1/4”, 1 male-threaded connection

Buffer tanks do not include an electric heating element.

160-1000 Lt

Without Heat Exchanger

Model 160 200 300 500 800 1000
Capacity Lt 162 200 302 470 805 1005
External diameter cm 60 60 60 70 99 99
Height cm 103.5 123 176 190 177 210
Net weight kg 42 48 63 106 134 153
Insulation thickness cm 5 5 5 5 7 7
Heat losses (ΔT 45K) kW / 24h 1.4 1.5 1.7 2.5 3.2 3.5
Maximum operating temperature °C 95 95 95 95 95 95
Energy class class B B B C C C

With 1 Heat Exchanger

Model 160 200 300 500 800 1000
Capacity Lt 155 192 290 453 776 971
External diameter cm 60 60 60 70 99 99
Height cm 103.5 123 176 190 177 210
Net weight kg 59 66 85 145 175 202
Insulation thickness cm 5 5 5 5 7 7
Heat exchanger surface (S1) m² 0.85 0.95 1.48 2.06 2.69 3.18
Heat exchanger capacity (S1) Lt 5.10 5.74 8.93 12.44 22.68 26.00
Heat losses (ΔT 45K) kW / 24h 1.4 1.5 1.7 2.5 3.2 3.5
Maximum operating temperature °C 95 95 95 95 95 95
Energy class class B B B C C C

With 2 Heat Exchangers

Model 160 200 300 500 800 1000
Capacity Lt 153 188 284 444 763 955
External diameter cm 60 60 60 70 99 99
Height cm 103.5 123 176 190 177 210
Net weight kg 65 79 113 164 195 225
Insulation thickness cm 5 5 5 5 7 7
Heat exchanger surface (S1) m² 0.64 0.85 1.27 2.06 2.45 3.18
Heat exchanger surface (S2) m² 0.42 0.62 0.85 0.96 1.46 1.49
Heat exchanger capacity (S1) Lt 3.83 5.10 7.66 12.44 20.11 26.00
Heat exchanger capacity (S2) Lt 2.55 3.83 5.10 6.06 11.96 12.17
Heat losses (ΔT 45K) kW / 24h 1.4 1.5 1.7 2.5 3.2 3.5
Maximum operating temperature °C 95 95 95 95 95 95
Energy class class B B B C C C

Electrical Resistor

features a built-in thermostat

Type Power
Screw-in electric heating element 1 ¼’’ with thermostat and safety cut-out 4 kW

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