** EOFY Sale On Now until 1st July! ** Australia-wide Fast Shipping

We carry more physical stock than anyone! Australia's Spa Parts & Pool Heater Experts.

Onga Ultra 2700 3300 4700 Spa Gas Heaters OBSOLETE - NLA

Tax included Shipping calculated at checkout.


The Onga Ultra 2700, 3300, and 4700 gas spa heaters were a Japanese heater branded by Onga, often fitted to a Spa Skid Pack. The control systems were poorly made, and no spare parts are available.

They were built in the 1990s & early 2000s, before being completely abandoned by Onga & Pentair several years ago.

All parts Obsolete and No Longer Available (NLA).

The best replacement is either the HX70 or HX120 for ground-mounting. If you can only replace with a wall-mounted heater, the JX130 or JX160 is the best option.

Payment & Security

Payment methods

  • American Express
  • Apple Pay
  • Google Pay
  • Mastercard
  • PayPal
  • Shop Pay
  • Visa

Your payment information is processed securely. We do not store credit card details nor have access to your credit card information. Major Credit Cards, PayPal, ApplePay, GooglePay accepted.

  • Identifying Parts

    Before making a phone call, the fastest way to identify parts is to send photos of the Front, Back, Sides along with any Measurements.

    Use the Contact Us form to upload from a Phone, Tablet or Computer.

  • Technical Support

    For Technical Queries, please use the Contact Form. Please include as much information as possible.

    We also have a range of manuals available.

    Electrical & gas work must be performed by a licensed & experienced person.

  • Heater and Spa Parts - Australia's Biggest & Fastest Shipper of Spa Parts & Pool Heaters

    About Us

    100% Australian Owned & Operated. A real, physical store, with shipping from Vic, NSW, Qld, & WA.

    We carry more stock of spa parts & pool heaters and ship faster than anyone!

    Ex-employees of the biggest manufacturers and distributors, so we know what we're talking about!