Harvia Delta D36 3.6 kW Sauna heater

The Harvia Delta D36 3.6kW Sauna Heater Specification

The Harvia Delta D36 3.6 kW Sauna Heater Buying Guide

From Order Confirmation to Your First 15-Minute Escape

The Harvia Delta D36 is the ultimate space-saver. Designed specifically for smaller cabins, its unique triangular shape means it can tuck neatly into a corner, leaving you more room to stretch out on the bench. It’s compact, efficient, and finished in a sleek, modern black.

Step 1: The "Is it the Right One?" Check

Before hitting "buy," let’s make sure the D36 matches your room. This heater is a specialist for small spaces:

• Sauna Volume: It’s perfect for rooms between 2 m³ and 4.5 m³.
• The Power: At 3.6kW, it’s powerful enough to heat a small cabin quickly but gentle enough that it doesn’t overwhelm the space.
• The Installation: The Delta is a wall-mounted heater. It comes with its own mounting bracket that actually allows you to install it right into a corner.

Step 2: Delivery Day (Lead Time)

Since the Delta is a compact unit, it arrives in a manageable, standard-sized parcel rather than a heavy pallet.

• Unboxing: When it arrives, take a moment to lift it out and admire that black finish. It’s a great-looking piece of kit.
• The Finish Audit: Just have a quick look over the casing. If you see any scuffs or dents from its journey, snap a photo and let us know within 24 hours.
• The Manual: Your manual is included in the box—keep this handy for your electrician, as it has the specific wiring diagrams they’ll need.

Step 3: Pre-Installation Prep

While you’re waiting for your installation date, there are two things you can do to get ahead:

1. The Stone Wash: The Delta takes about 11kg of stones. Give them a good rinse in a bucket of plain water to get rid of any dust.
2. Wall Check: Even though it’s small, the heater plus the stones weigh about 15-18kg. Ensure your sauna wall has a solid timber stud or a backing plate exactly where you want to mount the bracket.

Step 4: The Professional Connection

The D36 has its controls built right onto the base (integrated timers and thermostats), which makes the wiring much simpler for your electrician.

A Note for the Homeowner: We provide these as guidelines, but please always defer to your Registered Electrician’s judgment. They are the experts on-site.

• Single Phase Power: In most UK homes, this will be wired to a standard single-phase supply.
• The Silicone Rule: Even for a smaller heater, the final connection must be made with High-Temperature Silicone Cable (SiHF-JB). Normal cable will bake and fail in the heat—silicone keeps everything safe.
• The "Plug" Myth: Even though it’s 3.6kW, this is not a "plug-in" appliance. It requires a dedicated, fused circuit installed by your electrician.

Step 5: Your First Session

Once your electrician has signed off, you’re ready for the "First Heat" ceremony:

1. Stack Loosely: Place your washed stones into the heater. Don't wedge them in—let them sit naturally so air can flow around them.
2. The Burn-Off: Turn the heater on to its max setting for about 30-45 minutes with the sauna door open. You might notice a "new" smell—it’s just the elements settling in.
3. The First "Löyly": Once the smell has gone and the room is warm, close the door, wait another 15 minutes, and enjoy your first session.

Stewardship & Warranty

• Save the Certificate: Keep the Electrical Installation Certificate (EIC) that your electrician gives you. It’s your proof of professional installation for your 2-year warranty.
• Ladle Only: Pour water over the stones using a proper sauna ladle. A small amount goes a long way in a space this size!

User Manuals

Harvia Spare Parts

Harvia Delta (2D)

Harvia Delta (3D)

Harvia Delta D36 3.6 kW Sauna Heater Electrical Supply

Guidelines for the Harvia Delta D36 (3.6 kW)

A Note for the Homeowner: This guide is here to help you plan your space and have a smooth conversation with your contractor. Please always defer to your Registered Electrician’s professional judgment—they are the experts on-site and will ensure your installation is safe and perfectly suited to your home's power supply.

1. Power Demand & Load

The Delta D36 is a compact heater, but at 3.6 kW, it still requires its own dedicated circuit back to the consumer unit.

• Voltage: 230V Single Phase
• Amperage: Approximately 16 Amps
• Circuit Protection: Most electricians will install this on a dedicated 20A Type B RCBO. Using a "Type B" device is standard practice for sauna heaters as it handles the heating elements' resistance profile without nuisance tripping.

2. Wiring Requirements

Because the controls (timer and thermostat) are built into the base of the Delta D36, there is no separate control box to wire up. This makes for a very clean, straightforward install.

• The Silicone Rule: The final connection from the wall junction box to the heater terminals must be made using SiHF-JB Silicone Cable (rated to 180°C).
• Why it matters: Regular PVC cable cannot withstand the high temperatures inside the sauna cabin; it will eventually become brittle and fail. Using silicone cable is essential for safety and to keep your warranty valid.

3. Internal Thermostat & Safety

The Delta D36 manages its own temperature via an internal sensor.

• Mounting Height: To ensure the thermostat reads the room correctly, the heater should be mounted at the height specified in the manual (typically 150mm to 200mm from the floor).
• Safety Cut-out: If the stones are packed too tightly and the unit overheats, there is a manual Reset Button for the high-limit switch located on the bottom of the heater.

4. Final Sign-off

Once your electrician has finished the wiring and the "first heat" test, they will provide you with an Electrical Installation Certificate (EIC).

• Keep this safe: This document is your proof that the heater has been installed to national safety standards. You'll need it to validate your 2-year manufacturer’s warranty.

Harvia Delta D36 3.6kW Sauna Heater Delivery And Installation

The Delta D36 is a great choice if you’re working with a smaller space. It’s built to be tucked away in a corner, making it ideal for 1 or 2-person saunas. Here’s a plain-English look at how to get it set up and running.

1. When it Arrives

The Delta is pretty light, so it usually comes in a standard box.

• Take a look inside: It’s worth unboxing it as soon as it arrives, just to make sure everything is exactly how it should be.
• Check the finish: Give the black casing a quick scan for any scuffs or marks. We take a lot of care with shipping, but if something happens on the road, just let us know within 24 hours. It’s much easier for us to help you out if we catch it early.

2. Picking the Spot

This heater is designed for rooms between 2 m³ and 4.5 m³. Its triangular shape means it fits perfectly into a corner, but you can put it on a flat wall if that works better for your layout.

• The Bracket: It comes with a wall-mounting bracket. Since the heater and stones weigh about 18kg combined, make sure you're screwing into a solid part of the wall (like a timber stud).
• The Floor Gap: Aim to leave about 150mm to 200mm of space between the bottom of the heater and the floor. This gap lets the heater pull in cool air from the bottom so it can circulate the heat properly.

3. Sorting the Electrics

The Delta has its controls built right into the bottom of the unit, which keeps the wiring fairly simple.

Important: While this info helps with your planning, you should always follow your Electrician’s advice. They’re the ones on-site who can make sure everything is safe for your specific home.

• Dedicated Connection: Even though it’s a smaller heater (3.6 kW), it needs its own dedicated circuit. It isn’t a "plug-in" item, so a qualified electrician will need to wire it in.
• The Right Cable: Inside the sauna, your electrician will need to use Silicone Cable (SiHF-JB). Standard house wire can’t handle the heat and will eventually fail; silicone stays flexible and safe.

4. Prepping the Stones

The heater takes about 11kg of stones.

• Give them a wash: Rinse the stones in plain water before you put them in. This gets rid of any dust so your first sauna session smells fresh.
• Stacking: Drop the stones in loosely. You want to cover the elements, but don't pack them tight. Air needs to be able to move through the gaps to keep the heater from getting too hot and cutting out.

5. Your First Run

Before your first proper session, you need to "burn off" the newness of the heater.

1. The Test: Turn the heater up to its max setting.
2. Door Open: Keep the sauna door open and let it run for about 30 to 45 minutes.
3. The Smell: You’ll probably notice a bit of a metallic smell. This is just the manufacturing oils clearing off the elements for the first time. Once that’s gone, you’re all set for your first real sauna.

Harvia Delta D36 3.6 kW Sauna Heater: Warranty Guidelines

The Harvia Delta is a robust little heater, but like any high-quality appliance, it needs to be installed and used correctly to stay covered by the manufacturer's warranty. Here is a plain-English guide on how to keep yours protected.

1. Your Warranty Period

The length of your coverage depends on where the heater is installed:

• For your home: 24 Months (2 Years).
• For business use (e.g., a gym or rental): 3 Months.

2. The Professional Install

The most important rule for keeping your warranty valid is that the heater must be installed by a Registered Electrician.

• The Certificate: Make sure you get an Electrical Installation Certificate (EIC) from your electrician once they’ve finished. If you ever need to make a warranty claim, Harvia will ask to see this document to prove the heater was wired and earthed correctly.
• The Right Cable: If standard PVC house cable is used inside the sauna, the warranty will be voided. Your electrician must use High-Temperature Silicone Cable (SiHF-JB) for that final connection to the heater.

3. Caring for the Heating Elements

The elements are the "engine" of your heater. To keep them running smoothly for years, there are two things to remember:

• Don't Pack the Stones: The stones should be placed loosely in the heater. If you jam them in, the heat can't escape, which causes the elements to overheat and potentially fail.
• Fresh Water Only: Only use fresh tap water on your stones. Never use water from a swimming pool (chlorine) or the sea (salt), as this will quickly corrode the stainless steel and is not covered by the warranty.

4. Maintenance Basics

Sauna heaters don't need much work, but a little bit of "stewardship" goes a long way:

• Check the Stones: Once a year, take the stones out and check for any small fragments that have broken off. Clear them out and re-stack the stones loosely. This keeps the airflow perfect.
• Ladle, Not Bucket: Always pour water onto the stones using a proper sauna ladle. Dumping a whole bucket of water over the heater can damage the internal components.

5. What’s covered?

The warranty covers any manufacturing faults or defects in the materials. It doesn't cover general wear and tear, or issues caused by hard water limescale buildup. By following the "First Heat" process we mentioned in the setup guide, you’ll ensure the elements settle in correctly from day one.

Harvia Sauna Heaters — Returns & Refunds Policy

At Balance Recovery we want you to be completely happy with your purchase. If you change your mind, the following returns policy applies to our range of Harvia sauna heaters. It is offered in addition to, and does not affect, your statutory rights under the Consumer Rights Act 2015 and the Consumer Contracts Regulations 2013.

1. Your 14-Day Return Window

You may request a return within 14 days of receiving your Harvia sauna heater. To start a return, contact us at contact@balancerecovery.co.uk with your order number and details before sending anything back.

2. Condition & Packaging

To be eligible for a return, the heater must be unused and unopened, in its original, undamaged packaging, complete with all components, fittings, control units, stones and documentation included. Heaters that have been installed, wired in, used, or removed from their original packaging cannot be returned under this change-of-mind policy (your statutory rights for faulty goods are unaffected — see section 6).

3. Return Shipping

You are responsible for the cost of returning the goods. We recommend using a tracked, insured service suitable for a heavy item, as the heater remains your responsibility until it reaches our warehouse. Please retain your proof of postage.

4. Inspection on Return

Once your return arrives at our warehouse it will be inspected to confirm its condition and that it is complete. We aim to complete this inspection promptly and will keep you informed throughout.

5. Your Refund

• If, on inspection, the heater is returned complete and undamaged in its original condition, we will issue a full refund.
• If any part of the heater is found to be missing or damaged on inspection, the cost of the missing or damaged part(s) will be deducted from your refund, and the remaining balance refunded to you.
• Refunds are issued to the original payment method once the inspection is complete.

6. Faulty, Damaged or Incorrect Goods

This change-of-mind policy is separate from your rights if goods arrive faulty, damaged in transit, or not as described. Any missing, damaged or incorrect parts should be reported promptly on delivery (please refer to the product's manufacturer's warranty for the reporting timeframe). Where goods are faulty or damaged in transit, you will not be charged for return shipping, and we will arrange repair, replacement or refund in accordance with your statutory rights.

7. How to Request a Return

Email contact@balancerecovery.co.uk with your order number, the item(s) you wish to return, and the reason. We will confirm the return address and next steps before you send anything back.

8. Your Statutory Rights

Nothing in this policy affects your statutory rights. Under the Consumer Rights Act 2015, goods must be of satisfactory quality, fit for purpose and as described; under the Consumer Contracts Regulations 2013 you have cancellation rights for most items bought at a distance. This policy is provided in addition to those rights.

User Manuals

Harvia Spare Parts

Harvia Delta (2D)

Harvia Delta (3D)