What tonnage log splitter
Updated: 22 October 2026
The title says 8 ton or 22 ton, and the price sits underneath as if the number were a measured grade. What tonnage log splitter you need starts from a different fact: there is no regulated tonne test you can look up. The figure is usually the seller's calculated peak force from hydraulic pressure and piston area. This page stays on that point for the petrol machines in the [petrol log splitter comparison](/hub/forestry-tools/petrol-log-splitter). Peter F. read the October 2026 amazon.co.uk listings and UK guides, and did not measure ram force. A qualifying purchase can earn a commission at no extra cost to you.
The title says 8 ton or 22 ton, and the price sits underneath as if the number were a measured grade. What tonnage log splitter you need starts from a different fact: there is no regulated tonne test you can look up.
The title says 8 ton or 22 ton, and the price sits underneath as if the number were a measured grade. What tonnage log splitter you need starts from a different fact: there is no regulated tonne test you can look up. The figure is usually the seller's calculated peak force from hydraulic pressure and piston area. This page stays on that point for the petrol machines in the petrol log splitter comparison. Peter F. read the October 2026 amazon.co.uk listings and UK guides, and did not measure ram force. A qualifying purchase can earn a commission at no extra cost to you.
Our top picks
| Badge | Product | Force claim | Log size | Cycle time | Note | Price | Offer |
|---|---|---|---|---|---|---|---|
| Best overall |  Lazy-Log Lazy-Log LS-4 22 ton | 22 ton | 635 mm by 485 mm | 18 s full cycle | 8.2 | about £1,495.95 | View offer |
 Rotatech Rotatech RTP-GL-22T | 22-26 ton | n/a | n/a | 1.4 | about £1,599.99 | View offer | |
 SIP SIP 01987 8 ton | 8 ton | 520 mm length | n/a | 1.0 | about £1,048.17 | View offer |
On this page
What tonnes means on a log splitter
Peak force is roughly pressure times the effective area of the ram. Raise the relief pressure or widen the bore and the badge climbs. That maths is why many ratings are optimistic peaks rather than sustained splitting grades. BS EN 609-1:2017 is a safety standard for wedge splitters. It is not a method that certifies the tonne number on an amazon.co.uk title. When two machines claim 22 tons, you still do not know which one opens your knotty beech until you also know length, diameter, cycle time, and wedge shape.
Charts disagree because they mix domestic electric advice with petrol trunk work, and because US guides often talk in higher household bands than UK stove articles. Diameter-and-species tables are starting aids. None of them overrides a listing that refuses to state size limits. The check order is the petrol log splitter buying guide.
A UK starting matrix
As a rule of thumb only, a petrol guide often starts around 8-10 tonnes for stove hardwood roughly 40 cm across, 15-20 tonnes for knottier rounds, and 22 tonnes and up for trunk sections. Domestic electric articles frequently sit lower, around 5-7 tonnes for ordinary stove wood on a 13 A machine. Those bands collapse if the round is green, heavily branched, or longer than the beam. Size for the hardest realistic log you will process this winter, not for the average softwood offcut.
Seasoned oak at 30 cm can defeat a machine that sailed through straight pine at the same width. Wet bark and forks stop rams inside the stated maximum. Prefer a machine that prints both maximum length and maximum diameter, then treat the tonne band as a secondary filter. If your hardest log is a short, clean stove round beside a socket, reopen petrol vs electric log splitter before you climb this matrix.
Force without speed is a trap
A slow, strong ram and a fast, lighter stroke are different tools. Kinetic machines advertise short cycle times. Forest Master's kinetic marketing talks about a roughly three-second stroke, while a hydraulic pump may take well over ten seconds to extend and return. Lazy-Log prints 10 seconds out and 8 seconds back, an 18-second full cycle, beside a 22-ton claim and a 212 cc engine listed as 7 hp. That combination can be strong and still feel leisurely if you expected kinetic speed.
An engine sized for a high badge can also struggle to keep pressure on every stroke. Force on the decal does not guarantee throughput. Two-stage pumps help when they are named: low pressure for speed on free travel, high pressure when the wedge bites. If the listing never mentions cycle time or pump type, you are buying a peak force claim without a work-rate. SIP states 25 MPa and 520 mm length and leaves cycle time blank. Do not assume a higher tonne badge is faster. It is often the opposite when the same engine size is asked to push a larger ram.
Reading the badges in this comparison
SIP 01987 is an 8-ton horizontal at about £1,048.17, with 520 mm log length and 25 MPa. Diameter and cycle time are not stated. It is the clearest mid-band hydraulic here if you can lift the round and accept those gaps. Lazy-Log LS-4 is a 22-ton claim at about £1,495.95, with 635 mm by 485 mm, an 18-second cycle, and horizontal or vertical mode. That is the only row that puts force, size, and speed on the same page. It is the comparison's top pick on listing score, not a measured-force award.
Rotatech RTP-GL-22T claims 22-26 ton and 7 hp at about £1,599.99, with length, diameter, and cycle time missing, plus a UK review about unfinished assembly. A wide tonne range without size limits is a badge, not a capacity table. STAXXR and LUPENGSHOP show no tonne figure. They are tapered drills, so do not invent an 8-ton equivalent for them. Knots will still stop a 22-ton ram inside its stated maximum. Job shortlists are on best petrol log splitter UK.
Pick a band, then check the listing
Choose a starting band from the hardest realistic round, then refuse any listing that hides maximum length or diameter. Check orientation if you cannot lift the wood. Check cycle time if throughput matters. Check that two-hand controls and a guard are named. Check whether towable comes with real trailer paperwork. Only then compare shelf prices. If the badge is the only clear number on the page, walk away or hire a known machine for a day instead of trusting a peak-force slogan.
Common questions
What does the tonne number actually measure?
Usually a seller's calculated peak force from pressure and piston area, not a regulated lab grade. BS EN 609-1 is a safety standard for wedge splitters, not a tonne certificate. Treat the badge as a marketing peak until length, diameter, and cycle time appear beside it.
How many tonnes for seasoned oak or beech stove wood?
UK petrol guides often start around 8-10 tonnes for stove hardwood near 40 cm, with more force for knottier or larger sections. That is a rule of thumb. Prefer the machine's own length and diameter limits over any chart, including this one.
Why might a 22-ton machine feel slow?
A large ram and a modest engine can take a long full cycle. Lazy-Log's printed 18-second cycle, 10 seconds out and 8 back, is force with a stated pace beside a 7 hp claim. A missing cycle time hides that trade-off. Higher tonnes are not automatically faster.
Is 8 ton petrol enough if an electric 7 ton already exists?
Sometimes, when you need petrol portability at mid force and you can lift the round onto a horizontal beam. The badges are not directly comparable across power sources. Match size limits and whether a 13 A socket actually reaches the pile.
Do I size for my average log or my worst log?
Size for the hardest realistic round you will process. Average softwood will not reveal whether the machine stalls on your oak forks. Green wood, knots, and length beyond the beam all sit outside a tidy tonne chart.
Does a longer maximum log length matter more than extra tonnes?
Often yes. A round that will not fit the beam never meets the wedge, whatever the badge says. SIP prints 520 mm and no diameter. Lazy-Log prints 635 mm by 485 mm. Length and diameter come before climbing the tonne ladder.
Are cone splitters rated in tonnes the same way?
The cones in this set are not given tonne ratings. STAXXR and LUPENGSHOP are tapered drills, a different mechanism from a hydraulic ram. Do not invent an 8-ton or 22-ton equivalent for them, and do not rank them on this chart.
Why do UK and US guides disagree so much?
They mix different household volumes, species, and marketing habits. US domestic bands often sit higher than UK stove articles. Use the machine's own size limits and a UK rule of thumb, not a transplanted US band, when you choose 8 ton or 22 ton.
Related pages
Sources
Public UK sources from the research digest, last checked on 22 October 2026. Listing prices, stars and review counts are the amazon.co.uk figures saved for these five ASINs.
- HSE firewood processors bulletin (retrieved 22 October 2026)
- Supply of Machinery (Safety) Regulations 2008 (retrieved 22 October 2026)
- GOV.UK machinery guide (retrieved 22 October 2026)
- HSE PUWER overview (retrieved 22 October 2026)
- BS EN 609-1:2017 wedge log splitters (retrieved 22 October 2026)
- HSE petrol storage (retrieved 22 October 2026)
- GOV.UK E10 petrol (retrieved 22 October 2026)
- GOV.UK towing checks (retrieved 22 October 2026)
- Garden Review petrol log splitter guide (retrieved 22 October 2026)