What does dud shemesh mean in English?

דוד שמש means a solar water heater with storage and electrical backup. The electrical element heats stored water when solar heat is insufficient.

Does a dud shemesh also use electricity?

Yes. A דוד שמש normally includes an electrical heating element for periods when solar heat is insufficient. The boiler switch controls that electrical backup.

Does the red boiler light mean the water is hot?

No. The נורת חיווי shows the relevant electrical supply state. The light does not show water temperature or prove that enough hot water is ready for a shower.

How long does an Israeli boiler take to heat?

The Standards Institute says heating an entire 150-litre tank in winter can take up to three hours. A heat accelerator may produce a shower-sized quantity sooner, so three hours is not a universal setting.

Does every Israeli apartment have its own solar heater?

No. A building may have a central system, and current building rules allow solar thermal systems, qualifying heat pumps, and other efficiency-compliant systems. Ask what system serves the apartment.

Israeli Boiler Guide: Dud Shemesh and Dud Khashmal

Heater Systems

On the label or sign

דוד: hot-water storage tank

דודHot-water storage tank

dud

US English

Hot-water cylinder or storage water heater

UK English

Hot-water cylinder or storage water heater

What it is

In apartment conversation, דוד usually means the insulated tank that stores domestic hot water.

The difference

The common English translation, boiler, can suggest boiling water or apartment heating. A דוד is a domestic hot-water storage tank.

Common mistake

Do not assume דוד means a system that boils water or heats the apartment.

A rooftop solar collector with a white storage tank, dud shemesh

On the label or sign

דוד שמש: solar water heater with storage and electric backup

דוד שמשSolar storage water heater

dud shemesh

US English

Solar water heater with storage and electric backup

UK English

Solar water heater with storage and electric backup

What it is

A דוד שמש combines a storage tank and solar collectors. An electrical heating element provides backup when solar heat is insufficient.

The difference

The English phrase solar water heater can hide the electrical backup. The wall switch powers the backup circuit, not the sun.

Common mistake

Do not assume a דוד שמש lacks an electrical heating element.

A white wall-mounted electric hot-water cylinder, dud khashmal

On the label or sign

דוד חשמל: electric storage water heater

דוד חשמלElectric storage water heater

dud khashmal

US English

Electric storage water heater

UK English

Electric storage water heater

What it is

A דוד חשמל is a storage tank heated by electricity. A דוד חשמל does not have the solar collector function implied by דוד שמש.

The difference

The word electric does not mean instant or tankless. A דוד חשמל heats stored water.

Common mistake

Do not expect instant hot water from a דוד חשמל.

A central solar hot-water system on a residential roof

On the label or sign

מערכת מרכזית: central system
מערכת סולרית מרכזית: central solar system

מערכת מרכזיתCentral hot-water system

ma'arekhet merkazit

US English

Central or shared hot-water system

UK English

Central or shared hot-water system

What it is

A מערכת מרכזית is a building-wide hot-water system. The system may use central solar collectors, heat exchange, or another approved efficient source while apartments retain individual storage components.

The difference

A central system means an apartment may not have an independent pair of rooftop collectors. Current building rules also allow qualifying heat pumps and other efficiency-compliant systems.

Common mistake

Ask what system serves the apartment instead of assuming every apartment has separate collectors.

On the label or sign

קולטי שמש: solar thermal collectors

קולטי שמשSolar thermal collectors

koltei shemesh

US English

Solar thermal collectors

UK English

Solar thermal collectors

What it is

קולטי שמש are flat collectors that heat water or heat-transfer fluid. Dark glazed panels connect to water pipes.

The difference

Solar thermal collectors heat water or fluid. קולטי שמש are not automatically photovoltaic panels that generate electricity.

Common mistake

Do not call קולטי שמש electricity-generating solar panels.

Parts and Controls

An immersion heating element on its round flange, guf khimum

On the label or sign

גוף חימום: immersion heating element

גוף חימוםImmersion heating element

guf khimum

US English

Immersion heating element

UK English

Immersion heating element

What it is

A גוף חימום is the electrical resistance element inside the tank. The part mounts through the flange.

The difference

An illuminated boiler switch shows electrical supply. The light does not prove that the heating element is healthy.

Common mistake

Do not diagnose the גוף חימום from the switch light alone.

On the label or sign

תרמוסטט: thermostat

תרמוסטטThermostat

termostat

US English

Thermostat

UK English

Thermostat

What it is

A תרמוסטט controls electrical heating according to the temperature the component senses. A rental thermostat is not normally user-adjusted.

The difference

The heating element does not necessarily draw full power continuously. The תרמוסטט controls heating according to sensed temperature.

Common mistake

Do not assume the heating element runs at full power continuously whenever the switch is on.

On the label or sign

מאיץ חום: heat accelerator

מאיץ חוםHeat accelerator

me'itz khom

US English

Rapid-heating sleeve or heat accelerator

UK English

Rapid-heating sleeve or heat accelerator

What it is

A מאיץ חום is intended to heat a smaller usable quantity of water more quickly. The component is not visible from the wall switch.

The difference

A heat accelerator works with the storage heater. A מאיץ חום is not a separate instant water heater.

Common mistake

Do not assume a מאיץ חום provides separate tankless hot water.

A wall switch with a red indicator light for the water heater, mafsek dud

On the label or sign

מפסק דוד: water-heater switch

מפסק דודWater-heater switch

mafsek dud

US English

Water-heater switch

UK English

Water-heater switch

What it is

A מפסק דוד is the dedicated wall switch that controls electrical supply to the heating circuit. The switch usually has a visible indicator.

The difference

The switch controls electrical heating, including backup heating in a דוד שמש. The switch does not turn on solar heat.

Common mistake

Do not treat the switch lamp as proof that the water is already hot.

On the label or sign

נורת חיווי: indicator light

נורת חיוויIndicator light

nurat khivui

US English

Indicator light

UK English

Indicator light

What it is

A נורת חיווי shows the relevant electrical supply state after the switch.

The difference

A lit indicator means the electrical supply is on. A נורת חיווי does not show water temperature.

Common mistake

Do not read a lit נורת חיווי as hot enough for a shower.

A mechanical timer box for the water heater, sha'on la-dud

On the label or sign

שעון לדוד: water-heater timer
טיימר לדוד: water-heater timer

שעון / טיימר לדודWater-heater timer

sha'on / timer la-dud

US English

Water-heater timer

UK English

Water-heater timer

What it is

A שעון / טיימר לדוד is a mechanical, digital, or smart controller that limits or schedules electrical heating.

The difference

Mechanical, digital, and smart boiler controls can work differently. Dial positions and settings are not universal.

Common mistake

Check the specific timer controls instead of assuming every dial or smart switch works the same way.

On the label or sign

פלאנג׳: heater flange or service plate

פלאנג׳Heater flange

flange

US English

Heater flange or service plate

UK English

Heater flange or service plate

What it is

A פלאנג׳ is the assembly area through which the heating element and thermostat are fitted. Technicians use the term during repair discussions.

The difference

The word flange names an assembly area, not a complete diagnosis. A problem may involve the element, thermostat, seal, or scale condition.

Common mistake

Do not order a פלאנג׳ without a diagnosis of the element, thermostat, seal, and scale condition.

The English term or need is on the left. Look for the Hebrew on the right.
English term or need	Hebrew to look for	Keep in mind
Solar storage water heater	דוד שמשdud shemesh	Includes electrical backup for insufficient solar heat.
Electric storage water heater	דוד חשמלdud khashmal	Heats stored water without the solar collector function.
Central hot-water system	מערכת מרכזיתma'arekhet merkazit	Serves the building through a shared system.
Solar thermal collectors	קולטי שמשkoltei shemesh	Heat water or heat-transfer fluid.
Electrical heating element	גוף חימוםguf khimum	Electrical resistance element inside the tank.
Boiler switch	מפסק דודmafsek dud	Controls electrical supply to the heating circuit.
Indicator light	נורת חיוויnurat khivui	Shows electrical supply state, not water temperature.
Boiler timer	שעון / טיימר לדודsha'on / timer la-dud	Limits or schedules electrical heating.

The English term or need is on the left. Look for the Hebrew on the right.

English term or need

Hebrew to look for

Keep in mind

Solar storage water heater

דוד שמשdud shemesh

Includes electrical backup for insufficient solar heat.

Electric storage water heater

דוד חשמלdud khashmal

Heats stored water without the solar collector function.

Central hot-water system

מערכת מרכזיתma'arekhet merkazit

Serves the building through a shared system.

Solar thermal collectors

קולטי שמשkoltei shemesh

Heat water or heat-transfer fluid.

Electrical heating element

גוף חימוםguf khimum

Electrical resistance element inside the tank.

Boiler switch

מפסק דודmafsek dud

Controls electrical supply to the heating circuit.

Indicator light

נורת חיוויnurat khivui

Shows electrical supply state, not water temperature.

Boiler timer

שעון / טיימר לדודsha'on / timer la-dud

Limits or schedules electrical heating.

Mix-Ups to Avoid

Heater Systems

דודHot-water storage tank

What it is

The difference

Common mistake

דוד שמשSolar storage water heater

What it is

The difference

Common mistake

דוד חשמלElectric storage water heater

What it is

The difference

Common mistake

מערכת מרכזיתCentral hot-water system

What it is

The difference

Common mistake

קולטי שמשSolar thermal collectors

What it is

The difference

Common mistake

Parts and Controls

גוף חימוםImmersion heating element

What it is

The difference

Common mistake

תרמוסטטThermostat

What it is

The difference

Common mistake

מאיץ חוםHeat accelerator

What it is

The difference

Common mistake

מפסק דודWater-heater switch

What it is

The difference

Common mistake

נורת חיוויIndicator light

What it is

The difference

Common mistake

שעון / טיימר לדודWater-heater timer

What it is

The difference

Common mistake

פלאנג׳Heater flange

What it is

The difference

Common mistake

The English Term or Need Is on the Left. Look for the Hebrew on the Right.

Knowing the word is half of it. Say it out loud.

How we checked this guide

Frequently Asked Questions

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