The short version: a gas water heater costs 1,000 to 2,500 DH to buy, a solar water heater 6,500 to 20,000 DH depending on capacity. As long as the butane bottle stays subsidized at around 40 DH, gas keeps the accounting advantage: expect roughly 10 years to pay back a solar unit against butane, versus 2.5 to 3 years against an electric water heater. The subsidy phase-out now under way changes the picture: at the bottle's real price of 120 to 140 DH, payback drops to 3 to 4 years. These are 2026 market reference points, to be refined against your own consumption.
The question comes up at every home study we do: "solar is nice, but my gas bottle costs me 40 DH, why would I switch?" It is a fair question. It deserves numbers, not a sales pitch. Here is the comparison exactly as we present it to our clients, with prices observed in Morocco in 2026, including the cases where gas honestly remains the right choice.
One clarification before we start. A solar water heater is a thermal system: collectors heat the water in a storage tank directly, without producing any electricity. It has nothing to do with the photovoltaic panels that supply the house with power. The two actually work very well together on the same roof.
What do a gas water heater and a solar water heater cost to buy?
An instant gas water heater sells for 1,000 to 2,500 DH depending on flow rate and brand. A complete solar water heater runs from about 6,500 DH for a 120 to 150 litre unit to nearly 20,000 DH for a high-end 300 litre model, installation not included at most resellers. The investment gap therefore ranges from 5,000 to more than 15,000 DH.
| Equipment | Observed 2026 price | Indicative lifespan |
|---|---|---|
| Instant gas water heater (10 to 14 L/min) | 1,000 to 2,500 DH | 8 to 12 years with maintenance |
| Solar water heater 120 to 150 L | 6,500 to 8,500 DH | Over 10 years |
| Solar water heater 200 L | 8,500 to 10,000 DH | Over 10 years |
| Solar water heater 300 L | 14,000 to 20,000 DH | Over 10 years |
These ranges come from Moroccan distributors: equipment imported mostly from China, Turkey or Tunisia, with local production just getting started. Installation is added when it is not included: mounting frame, plumbing connection, electric backup. You will find our installed prices by capacity on our solar water heater page.
How much does gas hot water cost each month?
A family of four to five heating its water with butane generally goes through one to two 12 kg bottles a month for hot water alone, which means 40 to 80 DH at the subsidized rate. Over a year, between 500 and 1,000 DH. That is not much, and it is exactly why the gas water heater still equips the majority of Moroccan homes.
On the bill, subsidized gas is unbeatable. The real cost sits elsewhere: watching the level, buying a new bottle, carrying it, storing it, hooking it up. And when it runs out on a Sunday evening in the middle of winter, everyone knows what comes next. That is not an accounting argument, but after twelve years in this trade, it is the number one reason our clients switch.
Why the butane subsidy phase-out changes the math
The bottle you pay around 40 DH for actually costs 120 to 140 DH: the state covers the difference through the compensation fund. That subsidy is being gradually reduced. Nobody knows the exact timetable, but the direction is no longer up for debate: the price households pay is going to rise. An honest comparison therefore has to run at two prices, today's and tomorrow's.
At the real price of butane, the same family would spend 1,400 to 3,400 DH a year on hot water. The gas water heater, champion of low running costs, would then cost more to run than a paid-off solar unit. That is the whole point of buying in 2026: you lock in your hot water cost before the increase, instead of absorbing it bottle after bottle.
Our position as installers, with no hedging: if your gas water heater works well and there are two of you at home, keep it for now. If you are five in the house, if you are building, or if your unit is reaching the end of its life, solar is the option that protects you.
How long does a solar water heater take to pay for itself?
Against an electric water heater, expect 2.5 to 3 years in general. Against butane subsidized at 40 DH, around 10 years, which is long. Against butane at its real price, 3 to 4 years. These are 2026 market estimates, not guarantees: everything depends on your consumption and your region.
Take an illustrative calculation: a family of five in Casablanca, 200 litres of hot water a day, a 200 L solar water heater installed for around 11,000 DH. Heating that water electrically takes roughly 250 to 350 kWh a month. On the upper ONEE tiers, at 1.38 or 1.60 DH per kWh, that comes to 350 to 550 DH a month. Solar covers 70 to 90% of the annual need, the electric backup does the rest. The saving lands around 3,500 to 5,000 DH a year: the installation pays for itself in two to three years.
The same family on subsidized butane saves only 500 to 900 DH a year by going solar. That is why we never claim solar "pays for itself" in every case: against gas at 40 DH, it takes ten years or more. Since the equipment lasts beyond 10 years, with the collector often good for 15 to 20, the math does end up turning in your favour, and every butane price rise speeds it up. The logic is the same as for photovoltaics: we walk through it in our article on solar payback in Morocco.
The empty bottle mid-shower: what the numbers do not show
Comfort weighs as much as money in this decision. With a 200 or 300 litre solar tank, hot water is available around the clock, with no gas level to watch and no dependence on the delivery man. The built-in electric backup guarantees hot water even after three days of rain.
Then there is safety. A gas water heater burns butane inside the house, often in a poorly ventilated bathroom or kitchen: the risk of carbon monoxide poisoning is real, and Moroccan firefighters repeat the warning every winter. A solar water heater has no flame and no combustion. The collector sits on the roof, the hot water comes down, and that is all. The bottle you keep goes to the kitchen, where it is hardest to replace.
Thermosiphon, closed loop, evacuated tubes: which model for which region?
The thermosiphon is the best-selling model in Morocco: the tank is mounted above the collector and the water circulates naturally, with no pump and no electronics. Simple, reliable, little to break. The real question is the choice of loop and collector, which depends on your region and your water.
The open loop, also called direct, runs the domestic water itself through the collector. It is the cheapest option, and it works well on the coast, in Casablanca, Rabat or Agadir, where it never freezes. Its weak point: limescale. With hard water, the collector scales up within a few years.
The closed loop separates the two: a heat-transfer fluid heats the water through an exchanger. It costs 1,500 to 3,000 DH more, but it is essential anywhere it freezes, in Ifrane, the Middle Atlas and on winter nights around Ouarzazate, and we also recommend it where the water is very hard, even on the coast.
That leaves the collector type. The flat-plate collector is enough across most of the country. Evacuated tubes hold their efficiency better in cold, overcast weather: they earn their keep at altitude, rarely in Marrakech or Agadir where the flat plate does the job for less money.
Which capacity should you choose: 150, 200 or 300 litres?
Count 40 to 50 litres of hot water per person per day. A 150 L covers two to three people, a 200 L a family of four to five, a 300 L a large family or a guesthouse. Too small, and you will live on the electric backup and lose the point of going solar. Too big, and you pay for capacity that never gets used.
| Household | Recommended capacity | Indicative installed budget |
|---|---|---|
| 2 to 3 people | 150 L | 7,500 to 10,000 DH |
| 4 to 5 people | 200 L | 9,500 to 12,000 DH |
| 6 people and up, riad, guesthouse | 300 L | 15,000 to 22,000 DH |
One special case: if you connect the washing machine or dishwasher to the hot water line, or if you often have guests, take the next size up. Going from 200 to 300 litres costs less at purchase than regretting it afterwards.
What should a serious quote include?
A solar water heater quote worth the name spells out the equipment and the installation conditions in writing. Before signing, check at minimum:
- the brand and origin of the tank and the collector, with the exact capacity in litres;
- the loop type, open or closed, and the reasoning behind that choice for your region;
- the mounting frame and its wind resistance, especially on a flat roof;
- the planned due-south orientation and tilt;
- the safety relief valve, the thermostatic mixing valve and the electric backup;
- written warranties, separate for the tank, the collector and the workmanship;
- who handles after-sales service, and how fast they intervene.
Maintenance is light but real: an anode check every two years, draining, and cleaning the collector glass, which gathers dust just like photovoltaic panels. Our guide to maintaining solar installations in Morocco covers the right habits and the mistakes that void a warranty.
At Econiva Consulting, we have been installing solar water heaters since 2014 in Casablanca, Marrakech, Agadir and Rabat. The home study is free: we measure your actual consumption, check the roof and the water pressure, then tell you frankly whether solar makes sense in your home, and with which model. Request your study on the contact page or directly on WhatsApp at +212 661-764046.
Econiva Consulting team · May 12, 2026