How Much Does it Cost to Replace a Hot Water System?

How Much Does it Cost to Replace a Hot Water System?

Hot water. It’s something we can’t live without. So, when we have a problem with our hot water system; either the water isn’t getting hot enough, it’s not producing enough hot water, or worse, not creating any hot water at all, we want it fixed, and we cant it fixed fast!

In some cases, an electrician or a plumber can fix the system so you can go back to enjoying your long hot showers again in no time at all. But in other cases, your hot water system cannot be fixed and will need to be replaced. If you fear you’re facing the latter case, then you’re probably wondering how it does a replacement hot water system cost?

At iSpecialise, not only do we specialise in electric hot water systems, but as gas plumbers, we also specialise in gas hot water systems; both repairs and replacement installations. Today, I’ll take a look at hot water systems and how much you’re likely to be looking at to have a hot water system replaced in Auckland.

Type of the Hot Water System

The first factor in determining the cost to replace a hot water system is the type of hot water system. Obviously, it will be cheaper to replace/install an electric hot water system with another electric hot water system, rather than switching to gas, and vice versa. The installation cost for the same type of system can cost anywhere between $800 and $2500 depending on the circumstances, and $1200 to $3000 to switch from electric to gas.

In terms of the unit cost, electric hot water systems are the cheapest. You can expect to pay anywhere from $500 to $1900 for a new one. Next is gas hot water systems, which range between $850 and $1800 for the unit. Then there are solar hot water systems, which will set you back between $3600 to over $6000. Lastly, you have heat pump hot water systems, which range in price from $3300 to $4600.

Size of the Hot Water System

Another factor in determining the cost to replace a hot water system is the size of the system. This is pretty simple, the larger the system the more expensive it will be. The size of the system should be based on how many people are in the family or living in the home.

If you have 1-2 people living in your home, a 160L electric system, 90L gas, or 180L solar system is recommended. For 2-4 persons, a 250L electric system, 130L gas, or 200L solar system is recommended. For 4-6 persons, a 315L electric system, 200L gas, or 300L solar system is recommended.

Other Factors to Consider

Other factors which may contribute to hot water system replacement costs include delivery costs, site accessibility, and system removal and disposal.

In most cases, you will find that a good Plumber in Auckland, such as iSpecialise, will include the delivery of the new system and the removal and disposal of the old system in their installation cost.


Any problem with a hot water system is an issue. We rely on hot water daily and cannot go without it. In most cases, a plumber or an electrician can fix a hot water system without too much expense. However, when a hot water system cannot be fixed and a new system is needed, the cost can be expensive.

The cost to replace a hot water system will depend on the type of system you have if you change from one type to another at the time of replacement, the size of the system, the plumber’s installation costs and any associated costs. Generally, you’re looking onwards of $300 for installation, plus the cost of the system.

If you’re looking for an Auckland plumber to replace your hot water system, get in touch with the team at iSpecialise. We charge no call-out fee and can provide a fixed price quote for all hot water system replacements and installations.

Contact Us For a Quote or Booking Today

    Recent Posts

    Contact Us

    Contact the qualified team at iSpecialise for all your blocked drains, leaks, hot water, and general plumbing needs.

    Book a service call today.