Glossary

Glossary

Electric boiler –A water heater operated by an electric heating element.

Solar water heater – A water heater using solar energy (solar rays) and part of a solar system the function of which is to store hot water. Each heater has an electric heating element for heating the water when heating by the sun’s rays is not sufficient.

Heat exchanger heater – Usually a heat exchanger heater is used as a water heater utilizing solar energy (solar rays) similar to a solar water heater, and is part of a solar system the function of which is to store hot water.

Each heat exchanger heater has an additional unit (spiral pipe) through which a liquid flows that heats up from the solar energy, and which functions to transfer heat to the water inside the boiler.

The water inside the heat exchanger and the water in the boiler are two separate water systems.

Only the pipe comes in contact with the water in the boiler and heats it.

Each heater has an electric heating element for heating the water when heating by the sun’s rays is not sufficient.

Solar collector – Part of a solar system, which functions to convert direct radiation from the sun into heat energy. The panel consists of a system of pipes through which water passes. A black absorption panel is attached to this pipe system and functions to absorb solar radiation, as a result of which it heats up. This heat is transferred to the pipe system and from the pipe system to the water flowing within them.

Solar heating system – A system that utilizes solar energy for heating water, and consists basically of a solar water heater or a heat exchanger, a panel, and a system of pipes that connect the boiler to the panel.

Thermosyphon – A thermodynamic physical phenomenon and means of fluid transport, heat transfer, and the creation of circulation without a pump.

In a thermosiphon system the water heated in the panel flows to the top of the boiler.

Because hot water has a lower density than cold water, the hot water floats above the cold water.

Therefore, the cold water is at the bottom of the boiler and the hot water at the top.

The cold water flows from the bottom of the boiler to the bottom of the panel. The water heats up in the panel, rises up through the panel and flows back to the boiler. This creates a cyclic movement (circulation) of the water between the boiler and the panel.

Safety valve – An external safety accessory mounted on the boiler in order to protect the boiler from cracking as a result of increased pressure. When the pressure in the boiler reaches 8 bars, the safety valve opens and releases the pressure in the boiler (similar to the mechanism in a pressure cooker).

Non-return valve –  An external accessory mounted on the boiler in order to protect the boiler from emptying itself as a result of a water outage.

Anti-thermosiphon valve – An external accessory mounted on a boiler in a solar system when the boiler is lower than the top of the panel. It prevents hot water from returning from the boiler to the panel as a result of a physical phenomenon called reverse thermosiphon, where the hot water flows to the panel and cools and causes the tank water to cool down.

Heat Accelerator – A unit installed within the boiler that delimits a limited amount of water around the heating element and causes accelerated heating of that limited amount of water. This unit includes a long, narrow pipe that carries the heated water to the top of the tank. This unit is installed only in solar water heaters installed in a vertical position.

Flange – A set of components for the boiler that includes: a metal plate with a heating element and thermostat housing + a heat accelerator unit + a rubber gasket for the plate.

Heating element – a unit in the electric system of the boiler that converts the electrical energy into heat energy, and its function is to heat the water in a tank (similar to an electric water kettle)

Thermostat – A unit in the boiler’s electric system that is connected by means of wiring to the heating element and functions to control the water temperature. When the water temperature reaches 60°C this unit causes the heating element to disconnect from the electrical supply and thus stops the heating operation.

Differential thermostat – A temperature control unit that functions to control the temperature measured at the entrance and exit of the panel. As long as there is a temperature differential (differential) greater

than 7°C, the thermostat will command the circulating pump to operate.

Circulation pump – The unit creates a forced circulation of water between the panel and the boiler or heat exchanger.

Boiler – A nickname for a solar water heater or electric water heater. Boiler is an English word that has taken root in Israel. When people say ‘turn on the boiler’, they mean to turn on the electrical component in the water heater so that the water will heat up.

Kilocalorie (kcal) – calorie = A unit of measurement for heat and energy.

Kilo = one thousand 1,000. Units

Kilocalorie = 1,000 calories.

Watt – A unit of measurement for the electrical power of the heating element.

Power – The amount of work invested or received in a unit of time.

Temperature mixer – An external safety accessory installed in solar water heaters that aims to control the water temperature flowing from the boiler to the house. Since the solar water heater cannot stop the heating operation and the hot water can reach high temperatures, control and protection against burns is necessary.

This accessory is usually set at a temperature of 50°C in order to protect against burns.

In electric water heaters, when the water temperature is controlled by a thermostat this accessory is not needed.

Thermosyphon system – A solar system for water heating that includes: a water tank, a panel, and a connecting pipe. In this system the water circulates naturally according to the physical law of the thermosiphon.

This circulation method can only take place when the water tank is installed above the collector.

Open system –A solar system for heating water in which the water circulates between the water tank and the collector, and the circulating water is the water consumed.

Closed loop system –A solar water heating system with two separate water systems: One system with the water in the tank, which is the water consumed. A second system consists of the water in the panel and in the heat exchange spiral in the water tank. This water circulates between the exchanger and the panel and heats the water in the tank but is not consumed.

Forced system – A solar water heating system that includes at its base: a heater, a panel, a pipe that connects to a circulating pump, and a differential thermostat. In this system, the water is circulated with the help of the pump. These systems are used when the water tank cannot be placed above the collector.

Low silhouette system –A solar water heating system that typically has a lower height than a normal system. In a low silhouette system, the upper end of the panel reaches almost half the height of the water tank in order to hide part of the tank.

This system includes: a water tank, a panel, a connecting pipe, and an accessory that prevents hot water from returning to the boiler as a result of a physical phenomenon called reverse thermosiphon, in which the hot water flows to the panel and cools, thus causing the water in the tank to cool.

In the low silhouette system, the water circulates naturally according to the physical law of thermosiphons.

Raisers – In forced central systems these are the pipes that connect the panels on the roof to the water tanks located in the boiler room or in the house.

Limescale – Minerals that accumulate in water and decompose in the tank or panel as a result of heating the water.

Scale usually builds up around the heating element and the heat accelerator. These should therefore be replaced after short periods of time.

Enamel coating – A glasslike protective coating that protects the inner surface of a container in contact with water, and thus protects against rust. The water inside the tank is kept clean without any contaminants and / or rust or metal parts.

Enamel mark – This is a mark of the Nimrod company that guarantees that you have purchased a tank with enamel coating. This mark is applied to water tanks that have passed all the stringent tests that guarantee quality..

Standard mark – A permit from the Israel Standards Institute that confirms that a product is controlled by the Institute and is manufactured at the level of quality defined in the standard.

Mandatory standard mark – Since water heaters and panels are products that combine water and electricity, and their users are exposed and without clothes in the shower, the legislation states that it is forbidden to manufacture, market, or sell a water heater or panel without a permit from the Israel Standards Institute.

Installation Standard – Israel Standards Institute specification for proper installation, usually for new buildings.

Drinking water quality standard – An Israel Standards Institute standard that ensures that the water quality in this product is maintained and not damaged as a result of pollution resulting from the quality of the product and the materials from which it is made.

Piping – A system of water pipes that connects the water tank to the panel.

Circulation – Circulating water between the water tank and the panel or the pipes connecting them.

Magnesium anode – A sacrificial rod made of magnesium and designed to dissolve in water when the electric heater is turned on, to protect the metallic components inside the boiler from metal corrosion.

Cathodic protection – A method of stopping the oxidation and decomposition (rusting) process of metal bodies in water by creating an electrical circuit that makes the metallic structure of the container cathodic relative to an artificial anode region, using a magnesium anode.

Test pressure – the pressure at which the product is tested according to the definition in the Standard.

Disconnect faucet – A faucet used to disconnect the cold water supply to the system.

Spiral – A spiral pipe located inside a vertical heat exchanger heater, which is an integral part of the inner tank.

Coil – a spiral-shaped pipe located inside a horizontal heat exchanger heater, which is an integral part of the inner tank of the heater.

What is a standard – A standard is a document that specifies the technical requirements that apply to a product or service in order to suit its purpose. The standard deals with various features of a product such as: materials, structure, dimensions, operation, labeling, and packaging. There are standards that define testing methods, terms, and content.

What is an official standard – Solar and electric water heaters and solar panels have been declared an official standard. A product that has been declared an official standard must not be manufactured, sold, imported, or used unless the product has conformed to the requirements of the official and binding standard.

What is a standard mark – A standards mark confirms that the tested product has undergone the most rigorous tests that are more stringent than the official and binding standard. The Israel Standards Institute grants the manufacturer permission to mark its products with a standard mark after checking that the products conform with the standard and the manufacturer’s quality system. A standard mark for boilers is mandatory under the law, and ensures that the product is of the highest quality and undergoes rigorous testing in a number of Israel Standards Institute laboratories.

Renewal of a standard mark – The Israel Standards Institute grants the manufacturer a permit to mark its products with a standard mark for one year. The manufacturer must pass all relevant tests. The Institute renews the permit for another year for manufacturers that have passed all the stringent tests. It is therefore important to check that the manufacturer has a permit to mark its products with a standard mark and that this permit is valid.

Standard 69 –is an official standard for electric water heaters and heaters with thermostatic regulation and thermal insulation that defines test methods for electric water heaters and solar water heaters.

Standard 579/1 – is an official standard for flat panel water heating systems that defines test methods for solar panels.

Standard 5452 – Testing of products that are in contact with drinking water. All Nimrod products meet all the requirements of Standard 5452 for testing products that are in contact with drinking water.

Safety mark for standard 5452 – This safety mark tests products that come into contact with drinking water and their effect on water quality. At Nimrod, we meet all the requirements of Standard 5452 for testing products that come into contact with drinking water, and all our water tanks are coated with enamel for maximum protection. As part of this mark, stringent tests are performed at Israel Standards Institute laboratories and at laboratories that are certified by the Ministry of Health. The tests examine products that are in contact with drinking water and their effect on water quality. This mark ensures that no metals and toxins are excreted in the water.

ISO 9001 standard – The ISO 9000 series standards are quality standards for organizations in today’s business world, in which the supplier’s quality is as important as the quality of its products and services. This standard defines requirements for a quality management system. It increases customer satisfaction through the effective implementation of quality management systems in the organization and implementation of processes for continuous improvement of the system by ensuring compliance with customer requirements and legal requirements. Nimrod is certified under the ISO 9001 standard.

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