Safety valves for potable water heaters
A diaphragm pressure relief valve opens automatically to prevent pressure from exceeding the service pressure and closes automatically when the pressure has been reduced. Each unvented (pressurised) potable water heater should be equipped with at least one diaphragm pressure relief valve. Instant water heaters with a nominal volume below 3 litres are the exception to the rule. Only spring-loaded diaphragm pressure relief valves should be used up to a nominal volume of 5000 litres. In case of unvented potable water heaters with a nominal volume of more than 5000 litres and/or a heating capacity of more than 250 kW, the pressure relief valve has to be selected in accordance with the manufacturer's instructions. Table 1 determines the nominal size of pressure relief valves.
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Safety Center 4807
Safety group for potable water heaters with expansion vessel
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Safety Center 4807

SYRobloc-Safety Group
The SYRobloc-Safety Group optimally protects pressurised water heaters against excess pressure
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SYRobloc-Safety Group

Safety assembly 322
for electric storage water heaters up to 10 l, with stainless steel seat
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Safety assembly 322

Safety assembly 323
for electric storage water heaters up to 200 l, with stainless steel seat
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Safety assembly 323

Safety assembly 324
for electric storage water heaters up to 200 l, with pressure reducing valve and stainless steel seat
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Safety assembly 324

Pressure relief valve 2115
The pressure relief valve type 2115 is designed to protect pressurised fluid systems against excess pressure Pressure relief valve 2115

Pressure relief valve 2115 stainless steel
with stainless steel seat DN 15 + DN 20 for unvented (pressurised) water heaters Pressure relief valve 2115 stainless steel

Exchange cartridge 2116
for SYR pressure relief valves and safety groups DN 15 + DN 20 Exchange cartridge 2116

Thermostatic mixing valve 702 Safe
with protection against scalding Thermostatic mixing valve 702 Safe

Safety group with non return
safety group to protect unvented water heaters Safety group with non return

Safety group 0330 NF
for pressure resistant water heaters up to 10 kW Safety group 0330 NF

T&P Valve
Temperature and pressure relief valve with stainless steel seat for hot water storage tanks T&P Valve