Solar vs Heat Pump Water Heaters

Solar panels cloud blue sky
Exploring energy-efficient water heating options in Singapore? You’ve probably come across two familiar names: Solar water heaters and heat pump water heaters. Both have been around for over 30 years, and both use proven renewable energy technologies.

They also share another plus, being storage tanks that deliver strong, reliable water pressure, even for larger families with multiple bathrooms.

While solar has its charm, heat pump water heaters are the clear winner when it comes to all-weather performance, energy savings, and practicality in Singapore’s urban homes.

Here’s a quick side-by-side breakdown of how these two systems compare:
solar heat pump overall review compare table

1. Initial Cost

A basic instant water heater costs just $250. Compared to that, renewable systems like solar water heaters and heat pumps are in a completely different league! They're packed with high-tech components, built to last, and designed to save you plenty of money in the long run. But yes, they cost more upfront.

The difference?

☀️ Solar water heaters have huge tanks of 300 litres because they generate heat slower. This means the tank needs to store more hot water in advance. Combined with costly panels, they have the biggest price tag of all.

🌀 Heat pump water heaters generate heat faster. That allows for smaller tanks of about 80 litres and lower upfront costs.

• 60L Heat Pump – ~$3,400
• 300L Solar Heater – ~$8,500

2. Efficiency: What Saves More?

Both heat pumps and solar water heaters tap into renewable energy. One pulls heat from the air, the other from the sun. Sounds great, right?

But listen closely! Not all renewable systems are equally efficient, especially in Singapore’s tropical weather.
heat pump water heaters solar heat air sunlight
🌀 Heat pumps are the rising stars and for good reason. They can reach a wonderful 80% efficiency, which means you get 4 units of hot water for every 1 unit of electricity used. That’s serious performance. It's no wonder NEA Climate Vouchers have targeted support for only Heat Pump Water Heaters.
operating efficiency heat pumps solar

☀️ Solar water heaters have been struggling to keep up. Singapore is tropical, so we have cloudy skies and sudden rain showers all year round. When the sun disappears, solar systems automatically fire up their 3,000-watt backup heating elements. And just like that… your "eco" heater turns into a power-hungry beast.
rain fall rainy days solar heat pump singapore average rainfall meteorological service singapore
Solar Heat Pump Water Heater clear skies rare singapore cloudy performance
While both heaters are renewable, heat pumps offer consistent savings, rain or shine.

If you’re looking for reliable energy savings without praying for perfect weather, the choice is clear.
Minister Chan Chun Sing, Solar efficiency panels 15 trade industry

3. Easy to Install?

Gotta warn you here! One’s a Puzzle, the Other is Plug-and-Play

When it comes to installing a water heater, the simpler, the better.

☀️ Solar Heaters: These systems need to be installed on your roof, ideally on a south-facing slope, with zero shade from trees, neighbouring buildings, or anything else that blocks sunlight. Not all homes in Singapore are built for this.

The solar panels and tank need to be assembled piece by piece, then hoisted up and securely mounted. It’s labour-intensive, takes a full day, and comes with higher installation costs.
solar vs heat pump water heater
🌀 Heat pumps. These heaters are flexible, compact, and so much easier to work with. They can be installed indoors or outdoors, as long as there’s decent ventilation.

No panels, no sunlight needed, no special location. A replacement takes 6 hours, meaning you can have hot water by dinner time.

Neither system is simple, it is a huge central heater after all. But if I had to compare the two, heat pumps are the easier and faster choice.

4. Maintenance

Here’s something most people forget to ask: What’s the real cost of keeping your water heater running efficiently… year after year?

☀️ Solar water heaters may look low-maintenance sitting quietly on your rooftop, but they actually demand regular, professional cleaning at least every 6 months.

Why? Because dust, bird droppings, and debris will block sunlight and efficiency. Skip the cleaning, and you’ll pay for it later with higher electric bills when the backup heater kicks in.

Each cleaning session is around $600. That's about $1,200 per year to keep the system efficient.
Solar Heat Pump Water Heater install obstruction professional cleaning
🌀 Heat pumps, are much lower maintenance. Think of them like a high-efficiency version of your regular electric heater:

✅ Deep compressor clean – Every 3 years, ~$500
✅ Pipe checks – cooling and drainage
✅ Safety inspection – relief valve, thermostat, wiring
⏱️ Time required: ~1 to 1.5 hours

One service every three years, and you’re good to go. No climbing roofs, no cleaning twice a year. Easy.

🏁 Verdict: And the Winner Is…

Both heat pumps and solar water heaters are solid contenders in the world of renewable energy water heating. They help homeowners go green, cut carbon, and reduce long-term utility costs. But they don’t perform equally everywhere.

☀️ In places like Europe or the U.S., where sunshine is rare and precious, solar water heaters do great. But Singapore? We’re a whole different story.

In our tropical climate, there’s heat in the air all year round, whether the sun’s out or not. That’s why heat pumps outperform solar systems here. No need for crystal clear skies, or 3,000-watt backup elements kicking in every time it rains.

Heat pumps are also cheaper to install, easier to maintain, more efficient, and better suited for our urban homes. It’s no wonder condos, landed homes, and hotels clubs have long been using heat pumps.

Solar Vs Heat Pump FAQ

Do solar water heaters work during power outages?
Not entirely. Most solar water heaters rely on an electric backup element and control panel, which means they still need grid power to function reliably, especially during cloudy days.

If your area experiences frequent blackouts, you’ll need to install an additional battery or alternative power source to keep the system running consistently.
It depends. In landed homes with optimal roof space and sunlight exposure, a solar water heater may appeal to eco-conscious buyers. But in Singapore’s dense housing market, practicality often wins.

Many buyers prefer low-maintenance, space-efficient systems like heat pumps. So while solar sounds attractive on paper, it’s not always a guaranteed value booster.
Because they’re harder to install and less flexible. Solar water heaters require access to a rooftop with good sunlight exposure — something most HDB and condo owners don’t have. Roofs in high-rise buildings are typically shared or restricted, and even if accessible, shading from other buildings can reduce efficiency.

In contrast, heat pumps can be installed in balconies, service yards, or utility areas — making them a much more practical and popular choice for apartment living in Singapore.

Other Posts:

Top 3 Construction Mistakes in Landed Homes & How to Avoid

Changi Airport, Terminal 4 | AOS Bath Projects

Avoid Landed Home Nightmares!

Do you want to know the Top Construction Mistakes we hear about after owners shift in? You can avoid them all right at the start, during the construction phase. This can potentially save you so much money!

Problem 1: Roof is Dripping, But it's Not Raining!

The sky is clear, but water is mysteriously falling from your roof. What’s going on?

Mistake 1: Lack of Proper Drainage

Like an air con, a water heater drips water when running. If you have no proper drain point, that water will drip right off the roof, even on sunny days. That is really weird!

1-1 How to prevent this drip?

✅ Don't agree to a “free-flow” open roof. Always ask where the excess water will go.

✅ Have a drainage close to heater, within 1 meter, so that water can be neatly directed away.

Plan early. This can only be done during the construction stage.
roof drip water open drain gutter
wrong installation drain pipe too high drip water false ceiling
Heater Installed in False Ceiling? You need to watch out for this mistake too.

Make sure your ceiling has a drainage point. Otherwise, water will always drip right onto your ceiling board and create ugly water patches!
leak false ceiling water damage tank water heater

Problem 2: No Hot Water in Some Bathrooms!

You step into your gorgeous new bathroom, turn on the tap, and… ice-cold water greets you. Meanwhile, the master bathroom is enjoying piping hot water. What is going on?

Mistake 2: Wrong Pipe Layout

If there is a mistake in pipe work of the hot water recirculation loop, some bathrooms will be blocked from getting hot water.
2-1 What is a Recirculation Loop?

It is a pipe loop that goes around the house. Hot water circulates through this loop.

Loop must be continuous.

Every bathroom tees off from the loop. This setup allows you to get hot water fast, compared to if you run a direct pipe from the heater to each bathroom.
continuous recirculation loop pump central heater
loop within loop central heater dead zone
2-2 Mistake: Loop is NOT continuous

❌ Will create dead zones, in blue. Dead zones will not get hot water.

Hot water will only run through the continuous loop, the yellow dotted part.

⚠️ To fix this, you’ll need to hack the walls. A very expensive and painful mistake.
As installers, we will test the heater to check if:

✅ Hot water is coming out at the heater. This confirms the heater is working.

✅ At least one bath has hot water. This confirms the circulating pump is working.

⚠️ If other baths do not get hot water, there is a pipe issue. Look for the person who did the pipes.
site inspection job view discuss contractor architect maincon
Even with experienced teams..

This Mistake Happens 30% of the Time

How Can You Prevent This?
Get more parties involved. Call your contractor, architect, and consultant to check and confirm that the loop is continuous.

The final responsibility is yours, if something goes wrong, you foot the bill! Make sure it’s done right at the start.
PDF: Schematic diagram, continuous loop
thumbnail schematic continuous loop no dead end 2

Problem 3: Ugly, Exposed Trunking on Your Beautiful Feature Wall

You've forked out a fortune for the a unique, textured wall.. only to have it ruined by a streak of cheap looking white casing running right across it. UGH.

Mistake 3: Forgot to Conceal Wires Early

Here is another mistake that happens way too often!

3-1 ❌ Forgot to Conceal Wire

The heater is at the roof and you are planning to place the control panel on the second floor. The panel wire is ready, but it has not been run and is left coiled up at the roof!

This wire must be concealed early, before the tiles are up. otherwise, you will get an exposed trunking right across your tiles. Unsightly!
wire Cat 6 not concealed landed mistake
3-2 How to Conceal Wire?

✅ Check, check, triple check that the wires are concealed

✅ If done right, you will see a wire box and the end of the cable hanging out out if.

✅ For best results, run only one wire in the conduit pipe.
wire concealed cat 6 panel heater wire box landed mistake 2 cat 6

Problem 4: Hidden Costs that Run into the Thousands $1000s of Dollars.

You were told that the installation would be $1000, but this figure ends up at $2000. What happened along the way?

Mistake 4: Forgot to Provide Compulsory Items

Before the renovation, you will get a checklist. Get these items ready early and you will save money. Here is how:
4-1 Gate valves
Negotiate for these early, and it will be included in the pipe work. If you forget and request for them later, it may cost you $150+
pipe landed gate valve with without mistake
4-2 Isolator (Weatherproof Power Supply)
Be clear about the quantity and power rating early. Just like concealed wires, these need to be pre-planned.

If missed out, you will get:
❌ Ugly exposed wire tracks
❌ Higher chance of heater trips, no hot water!
❌ Long wait to get hot water
power source above ceiling central heater mistake
4-3 Scaffolding / Crane
Huge bonus tip that can save you One Thousand Dollars! If your heater needs to be lifted to the roof, you may need additional scaffolding or crane.

The good news is, you may not have to pay for these extras if you plan well. There is a good chance your main contractor or aircon supplier will be using this lifting equipment for other works.

Time your heater installation so that you can piggy back on scaffolding or the crane while it is at the site. This saves you a lot of time, and you don't need to pay twice. Do it early! If you miss the boat, too bad.
roof install hpi house crane 2
crane lift landed roof

Don't Forget! You'll Have to Pay Penalties.

These 4 mistakes are all about 'forgetting'. It happens in 70% of houses. Don't be too trusting or naive to think it won't happen to you!

The good part is that they can be avoided. Here are some tips for your success.

✅ Double Check. Use the checklist, don't skip.

✅ Cross Check. Get others involved. Don't leave it to just one company or one person.

✅ Get Involved. You don't need to do everything, but at least watch out.

Construction Mistakes FAQ

Can my contractor install the heat pump?
Heat pumps are specialised heaters that require care and professional handling. It is best if your Heat pumps are installed by water heater specialists.
Installing a pressure pump in your home will certainly increase your water pressure but this is not legal in Singapore. This is because a pressure pump draws water pressure away from your neighbours.

If all your neighbours are experiencing water pressure problems, it is advisable to contact your Town Council or MCST for a solution.
The Climate Vouchers can only be used to purchase energy-efficient household water heaters like heat pumps.

Climate Vouchers cannot be used for other types of water heaters.
You can install heat pumps at any level of the house. The water pressure will not be affected.

You will get the maximum possible water pressure at your shower. This is because the heat pump is a pressurised storage tank.

You will only get lower water pressure if you are using an instant or gas water heater.