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Haven & Plunge

Related guide

Infrared Sauna Accessories: What You Need and What to Skip

Illustrative photo of a sauna heater with stones, not the exact Northwood Sauna product

Illustrative photo of this product type, not the exact Northwood Sauna model. Photo: Unsplash.

Northwood Sauna

Diabase Sauna Stones, 3-5 in., 45 lbs (NS13B)

A 45 lb (20 kg) box of 3 to 5 inch diabase sauna heater stones, mined in Bavaria, Germany, per Northwood Sauna's listing.

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Diabase Sauna Stones, 3-5 in., 45 lbs (NS13B)

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Who it may suit

  • Traditional sauna owners replacing cracked or crumbling stones
  • Heaters whose manual calls for stones around 3 to 5 inches

Key Specifications

Stone Type
Diabase
Stone Size
3-5 in. (8-12 cm)
Weight
45 lbs (20 kg)
Origin
Bavaria, Germany (per the listing)
Model
NS13B

Key Features

  • Natural diabase rock
  • One size band, 3 to 5 inches
  • 20 kg box

Warranty

Warranty terms: check manufacturer.

Pros

  • + Stone type, size, and weight are all stated
  • + Diabase is the stone type many heater makers specify
  • + Replacing cracked stones is cheap compared with a heater repair

Cons

  • − One size only; some heaters call for larger stones
  • − 45 lbs may be more or less than your heater holds

Our Take on the Diabase Sauna Stones, 3-5 in., 45 lbs (NS13B)

By

Short answer: a 45 lb box of 3 to 5 inch diabase sauna stones from Northwood Sauna, sold on Amazon and mined in Germany per the listing. Diabase is a common heater stone. Before buying, check your heater’s manual for the stone size and total weight it calls for.

Match the stones to your heater

Here’s what the spec sheet won’t tell you: the right stones depend on your heater, not the stone seller. Heater manuals give a size and a total weight. Harvia’s own AC3020 stones, for example, are 10 to 15 cm, larger than these 8 to 12 cm stones. Use what your manual says.

When to replace them

Stones crack and crumble with use. Your heater’s manual says how often to check them and how to restack them.

What you get

20 kg of split diabase in one size band, model NS13B. The listing offers a refund if you’re not satisfied.

Bottom line: a well-described replacement set, if your heater takes 3 to 5 inch stones. Amazon sets the price. See Sauna Accessories Worth Buying.

Not medical advice.This page is general product information. Heat and cold exposure aren't safe for everyone. Talk to a physician before starting a sauna or cold plunge routine, particularly if you are pregnant or have a heart, blood pressure, or circulation condition. See our Editorial Policy.

Alternatives to Consider

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Frequently Asked Questions

Do I need a special bucket for löyly?

A wood or heat-rated bucket paired with a long-handled ladle is the traditional choice and holds up better to repeated heat exposure than a generic container.

What accessories work with infrared cabins too?

Thermometers, backrests, and lighting accessories generally work across both infrared and traditional cabins; buckets and ladles are specific to traditional steam sessions.