Solar or electric water heater? By the numbers

In short: an electric heater is cheaper upfront and simpler to install, but it heats with electricity around the clock, so the monthly bill stays consistently higher. A solar heater costs more upfront and needs a suitable roof, but it heats from the sun for free, so it saves you money over the long run. The right choice comes down to two questions: do you have a roof that gets sun, and how much do you actually use? This article compares the two honestly, by the numbers, without tilting toward either option, so you can decide clearly.

The cost difference — upfront and monthly

Solar heater · Electric heater

Upfront cost · Higher (system + installation) · Lowest

Monthly bill · Lowest (heats from the sun) · Higher (daily electric heating)

Long term · Pays back its cost, then saves · Cost keeps stacking on the bill

Needs roof/sun · Yes · No

Installation · Slightly more involved · Simple

The exact figures for your home — price, bill, and payback period — are set during the free inspection, but the structural difference in the table holds regardless of your specific house: electric has you paying every month, solar has you paying more once upfront and then less on the bill afterward. Maintenance factors into the equation too — a solar heater kept up with regular maintenance holds its efficiency and its savings for years, and you can see what that maintenance involves in Maintenance.

The honest drawbacks of each option

There's no perfect option, and honesty here matters more than the sale:

• Electric's drawback: it heats with electricity every single day without exception, so the bill stays a fixed monthly burden no matter how cheap the unit was to buy. And as electricity prices rise over time, that burden grows rather than shrinks.
• Solar's drawback: the upfront cost is higher, it needs a roof that gets sun and has enough space, and installation is a bit more involved than electric. On cloudy days it partly relies on the backup heater. We cover these drawbacks in full honesty in Solar heater drawbacks, and how to deal with any potential fault in Solar heater faults and fixes.

The goal isn't to hide a flaw to close a sale — it's for you to go into the decision seeing the full picture.

So which one actually suits you?

Let's be straightforward instead of selling:

• Solar suits you if: you have a roof that gets sun, your usage is medium to high, and you want real savings over the long term. Here solar clearly wins, because the monthly bill drops and the upfront cost pays itself back.
• Electric suits you if: there's no suitable roof at all, your usage is very low and individual, or your budget right now is tight and you need a quick, cheap solution.

This neutrality is intentional — the best decision is the one that genuinely fits your home, not the one we're trying to sell you. For the wider picture on the decision, read Is a solar heater worth it?.

If you go solar, which tier suits you?

If your usage is moderate and your budget is tight, the economy heater tier gives you the same core benefit — free heating from the sun — at a cost closer to electric. If your usage is higher (a villa, a large household), a higher tier like Nobel Hyperion gives you proven performance over the long run. The right tier is set by your actual usage, not by the highest price available.

Lifespan and maintenance change the equation

The money comparison isn't complete without factoring in time. An electric heater's simple installation doesn't change the fact that the monthly bill stays there for as long as you use hot water — year after year, with no accumulated saving. A solar heater is the opposite: once its upfront cost is paid back through savings, it keeps saving you money for close to free for years, provided it's kept up with simple, regular maintenance. Neglecting maintenance is the single biggest thing that erodes a solar heater's efficiency over time, which is why we always recommend a clear maintenance plan from day one — whether that's periodic maintenance or emergency maintenance coverage if something breaks unexpectedly. Compared side by side, maintenance costs over the years stay well below the bill difference you'd have paid choosing electric instead.

Can I start with electric and switch to solar later?

Yes, and it's a realistic option if your budget is tight right now. There's nothing stopping you from installing electric now and planning to switch to solar once you're financially ready, as long as the roof is still available and suitable when that time comes. The one thing worth doing: if you're planning to switch eventually, ask about the right roof space from the start, so you don't need extra modifications when you make the switch. The decision doesn't have to be final on day one.

So how do I decide?

The decision needs three things: knowing whether your roof is suitable, knowing the cost-and-savings picture for your home, and choosing a trustworthy installation company (because installation quality affects lifespan and performance as much as the product itself does — details in How to choose a reliable installation company). We settle all three during the free inspection — we see your roof, learn your usage, and tell you honestly which option saves you more.

Find your right capacity ← then Book a free inspection and we'll tell you honestly: solar or electric for you.