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Balboa 3kw M7 Heater - 58118 - (Plastic Box Fit)


Part Number: HTPS212

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Old price: £135.67  


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Balboa 3kw M7 Heater Assembly - 58118 - Plastic Box Fit - Titanium

A very common 3kw Balboa M7 hot tub heater assembly with studs to attach to plastic GL & GS control packs. These heaters have the highest quality titanium coated element and use the latest M7 sensor technology, this comprises of a sensor at each end of the heater tube to check water temperature and water flow rate. Balboa 58118 M7 heaters are now by far the most common spa heaters in the world.

Supplied complete with 2x new O-ring gaskets, sensors, 2x 2" heater unions and tailpieces.



Volts ~ 230

Hz ~ 50

kW ~ 3.0

Amps ~ 11.5 - 12.0

Heater Element Material ~ Titanium Coated

Sensors ~ 2x 12" M7 sensors

Flow Rate Required ~ 21 GPM

Part Number - Balboa 58118, can be replaced by other part numbers.


Length: 380mm

Total Length: 495mm (including unions)

Diameter: 60mm

Distance Between Terminals: 32mm




Plumbing ~ 2-inch unions, female collars thread onto the spas existing male plumbing tailpieces. (Internal thread diameter of the female collars are 78mm).


Electrical ~ The two individual M7 sensors plug directly on to Balboa circuit boards. Heater terminals are connected by copper straps from the PCB and secured by two 3/8" nuts.

Fixings ~ This type of M7 heater is secured onto the Balboa control box by two studs and two 3/8" nuts, one on the top of the heater tube and one underneath.

Compatible Control Boxes

This 3kw M7 heater assembly 58118 is compatible with all plastic GS & GL Series Balboa spa control boxes. GS series models GS500Z, GS510, GS501, GS501Z, GS501SZ, GS510SZ, GS520DZ, GS523DZ, GL2000 & GL2001 systems.

Fits Spa Brands

Can be found a huge number of American spa and hot tub brands in the UK and Europe along with Chinese spa manufacturers. Brands such as Canadian Spas, DanZ, Wellis Spas, Passion Spas, Cove Spas, Hydropool Hot Tubs, Aegean, Artesian, Beachcomber, Marquis Spas, Cal Spa, Catalina Spas, Coast Spas, Spaform, Fonteyn, Great Lakes, Leisure Bay, Master Spas, Vision & Spa Crest, Viking Spas & many more.



Additional Information

When connecting the two power copper straps from the PCB to your new heater terminals be very careful and hold the base of the terminal with a small 1/4" spanner or long nose pliers before tightening the two 3/8" nuts up on top. This is a genuine Balboa product, stay well clear of cheap internet copies.

Need Help?

If you require any help with choosing your replacement hot tub heater please do give us a call or email us through our contact us page. We many years of hands-on experience with all makes and models of hot tubs and spas.

Heater Specifications

Hot tub / Spa heater assembly
Balboa M7 with studs - 58118
11.5 -12.0
2 x 12" M7 sensors
M7 Technology by using two M7 sensors one at each end of the heater assembly
15" long x 2" diameter
Fixed onto the control box by two studs one on the top & one underneath
2" white plastic female sockets to connect to the spas plumbing
Plastic style GS & GL Balboa control boxes
This is a genuine Balboa product stay well clear of cheap internet copies.

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Delivery Services & Prices

Here at Hot Tub Parts Superstore, we strive to deliver your purchased products quickly, efficiently and safely to your requested delivery address. We currently use a few shipping companies such as DPD, UPS, & DHL to achieve the most cost-effective methods for delivering the different types of products that we stock.

All our shipments are tracked and signed for by our designated shipping companies. If you leave us your mobile telephone number at the payment checkout we will pass this on when shipping with DPD. DPD offer great service and will notify you by text your delivery date along with your hour time slot on the day of delivery.


**Please note all delivery costs stated below include VAT**

United Kingdom - Mainland

Delivery to England, Wales & Scotland (Excluding Scottish Highlands & Islands).

Order values over £100 - Free DPD Next day delivery. (Excludes hot tub covers)

Order values between £0-£100 - £7.80 DPD Next day delivery.

DPD Next day delivery before 10:30 am - £16.80

DPD Standard Saturday delivery - £7.80 (Free on orders over £100)

DPD Saturday AM delivery - £16.80

Provide your mobile phone number during checkout and you will receive a text from DPD on the morning of delivery day with your 1-hour delivery slot.

Spa and hot tub covers are freight delivered to UK Mainland only at a cost of £20 inc VAT due to size and weight. Saturday AM delivery options are also available to UK customers at £48 inc VAT. Customers requiring delivery of a spa cover outside UK Mainland please contact us for a shipping quote.


Scottish Highlands & Islands

Delivery to the Scottish Highlands & Islands (Up to 20 kgs), Prices are doubled when over 20 kgs.

DPD 2-5 Days - £24.00


Northern Ireland

Delivery to Northern Ireland (Up to 20 kgs), Prices are doubled when over 20 kgs.

DPD 2-3 days - £16.80


Republic Of Ireland


Delivery to the Republic of Ireland (Up to 20 kgs), Prices are doubled when over 20 kgs.

DPD 2-3 days - £15.00


Isle of Man & Isle of Scilly

Delivery to the Isle of Man (Up to 20 kgs), Prices are doubled when over 20 kgs.

DPD 2-3 days - £25.20

Jersey & Guernsey

Delivery to Jersey & Guernsey (Up to 20 kgs), Prices are doubled when over 20 kgs.

DPD 2-3 days - £25.20



Europe Zone 1 

Delivery to Belgium, France, Germany, Luxembourg, Netherlands. 

Standard Euro Delivery 2-3 days - £15.00 (upto 20kgs) Price doubles when over 20 kgs.


Europe Zone 2


Delivery to Austria & Denmark. 

DPD Classic 3-4 days - £20.40 (upto 20kgs), Price doubles when over 20 kgs.

Europe Zone 3 

Delivery to Croatia, Estonia, Finland, Hungary, Poland, Portugal, Slovenia & Sweden.

DPD Classic 4-6 days - £33.00 (upto 20kgs), Price doubles when over 20 kgs.

Europe Zone 4

Delivery to Bulgaria, Greece, Latvia, Lithuania, Romania.

DPD Classic 4-9 days - £44.40 (upto 20kgs), Price doubles when over 20 kgs.

Europe Zone 5

Delivery to Czech Republic, Slovakia, Spain (Mainland), Italy.

DPD Classic 3-4 days - £25.20 (upto 20kgs), Price doubles when over 20 kgs.

Europe Zone 6

Delivery to Malta & Russia.

Parcel Force Euro 4-9 days - £86.40 (upto 20kgs), Price doubles when over 20 kgs.

Europe Zone 7

Delivery to Canary Islands: Gran Canaria, Tenerife, La Palma, Lanzarote, Fuerteventura, La Gomera, El Hierro.

DPD Classic 3-5 days - £92.40 Upto 5kgs, £133.20 (upto 10kgs), £216.00 (upto 20kgs), Doubles over 20kgs.

Europe Zone 8

Delivery to Balearic Islands: Majorca, Minorca, Ibiza, Formentera, Cabrera.

DPD Classic 3-4 days - £36.00 (upto 20kgs), Price doubles when over 20 kgs.

Europe Zone 9

Delivery to Iceland & Serbia.

DPD Classic 4-6 days - £76.80 (upto 20kgs), Price doubles when over 20 kgs.

Europe Zone 10

Delivery to Norway. For us to send to Norway we require your Personal Identification Number (PID).

DPD Classic 4-6 days - £76.80 (upto 20kgs), Price doubles when over 20 kgs.

Europe Zone 11

Delivery to Switzerland.

DPD Classic 3-4 days - £54.00 (upto 20kgs), Price doubles when over 20 kgs.

Europe Zone 12

Delivery to Cyprus.

DPD Classic 3-6 days - £88.80 (upto 5kgs), £132.00 (upto 10kgs), £218.40 (upto 20kgs), £436.80 (over 20kgs).

International Zone 13

Delivery to Bahrain, United Arab Emirates, Qatar.

DPD Air Classic 3-6 days - £138.00 (upto 5kgs), £210.00 (upto 10kgs), £288.00 (upto 15kgs), £360.00 (upto 20kgs).


Worldwide Shipping

We will ship spa parts out to any part of the world, if you have seen a part on our website that you can't source locally we will be more than happy to send it out for you simply give us a call or email us with your delivery address and we will come back to you as quickly as possible with a shipping quote.

Shipping Chemicals & Liquids


Due to international chemical handling laws, we can only deliver chemicals and liquids to mainland UK.

Out Of Stock Actions

In the unfortunate event of a product that you have ordered being out of stock here is what action is taken.

1/ You will be contacted firstly by phone from the number given on the order or email you if unsuccessful.

2/ If possible, offer you an alternative product that we have in stock.

3/ Alternatives are not always possible so in this case, we would either place the item on backorder or offer you a full refund for your purchase.

4/ Refunds can take up to 7 days, back-ordered items in most cases take as a rule 7-10 days to re-stock.

If an item gets put on backorder from a multiple item order we will give you the following choices.

1/ Refund you for this item and send the remainder of the order out to you, notifying you when it returns to stock so you can purchase it.

2/ Hold the full order and wait for the back ordered item to return back into stock, sending you a complete order.

Unfortunately, we don't cover double shipping orders, for example send in-stock items out and then ship the remaining back-ordered item when it returns in stock. We are very sorry for any inconvenience caused by this.

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