Trade Chemicals C100 Central Heating Inhibitor, 5L

Trade Chemicals C100 Central Heating Inhibitor is a concentrated treatment for protecting boilers, radiators and internal pipework. The listing says 5L treats 500L, making it aimed at larger system volumes or dosing more than one system as appropriate.

At a glance

Concentrated inhibitor formulated for central heating systems.
The manufacturer says it helps reduce corrosion and scale build-up, and helps control hydrogen gassing, microbiological growth and boiler noise.
Suitable for radiators and other metal components in the heating circuit, according to the listing.

Price

£19.21Save 54%

Reference price: ~~£41.94~~

Price checked: 12 Nov 2026

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Pros and cons

Pros

A 5L container with a stated treatment capacity of 500L suits buyers treating a larger system volume or planning doses for multiple systems.
The described protection targets several common heating-system concerns, including corrosion, scale and hydrogen gassing.

Technical specifications

3 specifications

Identity
Brand	Trade Chemicals

Treatment claims
Container volume	5L
Claimed system volume treated	500L

What to know before buying

The listing says the required dose depends on system size and that overdosing will not harm the system when used as directed. For gravity-fed installation, its directions describe draining, dosing via the feed and expansion tank, refilling and venting. It also mentions a pressurised method.

Who is it for?

A good fit for

Householders or heating professionals looking for a concentrated inhibitor for a central heating circuit.
Buyers whose required treatment volume is close to the listing's stated 500L capacity.

Less suited to

Anyone seeking a ready-mixed antifreeze or a product explicitly intended for a different type of heating system, as those uses are not established here.

Trade Chemicals C100 Central Heating Inhibitor, 5L · photo 2 — Additional product photo 2

Customer reviews on Amazon

4.7 / 5 · 370 ratings

5 stars80%80%
4 stars15%15%
3 stars4%4%
2 stars1%1%
1 star0%0%

Customer feedback describes the inhibitor as good quality and effective against corrosion, scale and microbial growth. This aligns with the product's stated purpose, but customer perceptions do not independently confirm the claimed protection or the stated 500L treatment capacity. The overall rating distribution is mostly five-star, with a smaller share of lower ratings, so experiences are not entirely uniform.

Positive themes

Customers describe the product as good quality and effective at preventing corrosion, scale and microbial growth.

Frequently asked questions

How much system volume does the 5L container treat?

The listing claims that 5L treats 500L. It advises using the appropriate quantity for the system size.

What does the inhibitor claim to protect against?

The listing says it helps reduce corrosion and scale, and helps control hydrogen gassing, microbiological growth and boiler noise.

How does the listing describe adding it to a gravity-fed system?

Its directions describe turning off the system components and water supply, draining the system, adding the required dose via the feed and expansion tank, then refilling and venting. It also mentions a pressurised method.