What a boiler does in a central heating system
The boiler heats the water that a pump sends around the radiators or the underfloor pipes, then back again. Many boilers also make hot water for the taps, either instantly (a combi boiler) or by heating a storage cylinder.
Gas and electric boilers do the same job and feed the same radiators and floors. The difference is where the heat comes from, and that changes what the home needs, what it costs to run and how much heat the boiler can deliver.
What each one needs at home
A gas boiler needs a natural gas connection, a connection and check that meet the gas company’s requirements, and a flue that takes the exhaust safely outside. It can go in a kitchen, a utility room or an enclosed balcony.
An electric boiler needs no gas and no flue, so it can go almost anywhere, including inside a cupboard. What it does need is electrical capacity: a heating boiler draws a large current, so the meter, the cables and the distribution board must be able to take it. In some homes that means a supply upgrade; in others it rules out a large electric boiler.
Power and the size of the home
Gas boilers come in outputs that comfortably heat large apartments, duplexes and villas, and still have capacity for hot water. Electric boilers are limited by the supply available; they suit apartments and smaller spaces well, but a large villa on electricity alone is usually better served by a heat pump.
Either way, the boiler is sized from the heat the home loses, room by room. An oversized boiler switches on and off constantly and wears faster; an undersized one cannot keep up on the coldest nights.
Running costs
An electric boiler turns almost all of its electricity into heat, which sounds ideal, but each unit of electricity usually costs more than the same heat from gas. Household electricity in Egypt is billed in tiers, so a heating season of heavy use can move the whole bill into a higher tier.
A gas boiler’s running cost follows the gas price and its own efficiency; a condensing boiler recovers extra heat from its exhaust. In practice, for a whole home heated many hours a day, gas usually costs less to run. For a small, well-insulated apartment heated in the evenings, the gap narrows. Your own usage decides it, which is why we look at the home first.
Safety and servicing
A gas boiler must be installed and serviced by qualified people: the gas connection, the flue and the combustion are checked at every service, and the room needs the ventilation the manufacturer asks for. Done properly, it is a safe, ordinary appliance in millions of homes.
An electric boiler has no combustion and no flue, so there is less to check, but the electrical connection and the safety devices still matter. Both need the water side looked after: system pressure, the expansion vessel, the pump and the water quality, ideally once a year before winter.
At a glance
| Gas boiler | Electric boiler | |
|---|---|---|
| Needs | Gas line, flue, ventilation | Enough electrical capacity |
| Suits | Large apartments, duplexes, villas | Apartments and smaller spaces without gas |
| Running cost | Usually lower for long daily use | Higher per unit of heat; tiered tariffs |
| Where it goes | Where the flue can reach outside | Almost anywhere indoors |
| Servicing | Yearly, including gas and flue checks | Yearly, electrical and water side |
Which one is right for your home?
Start with two questions: is there a gas line, and what electrical capacity does the home have? Then look at the size of the home and how many hours a day it will be heated. If neither boiler fits well, a heat pump is the third option worth considering.
Conversion EG has designed and installed heating in Egypt since 2010, with one team from design and supply through installation and maintenance. Brands we install include Junkers, De Dietrich and Style Boiler. Book a site survey and we will size the boiler for your home.
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