Strong-value alternatives

Glow-worm boilers

Compact and Ultimate3 models form the genuine five-year choice, while Energy7 provides 25, 30 and 35 kW options with longer conditional cover.

Compare the range Request a date

Warranty information

Glow-worm Compact and eligible Ultimate3 packs provide five-year cover. Energy7 has seven years standard and may receive up to ten years with the eligible Power Filter, installer registration and servicing; exact 35 kW eligibility is confirmed in writing.

Check manufacturer information Exact product image via Lords Builders Merchants

Choose your output

Glow-worm combi range

Property guidance is an initial guide only. Water pressure, flow rate, heat loss and simultaneous hot-water use must be checked before final selection.

Value range

The nearest genuine lower-cover equivalents to the Baxi 400 range.

24 kW

Glow-worm Compact

Smaller homes with one bathroom

5 years

Calculated installed price

£1,690

Baxi 424 base £1,850 − £161.18 supply difference, rounded to the nearest £10.Check supply source

Combi-conversion basis. Final price depends on the property and installation requirements.

Request this boiler

30 kW

Glow-worm Ultimate3

Typical family homes with one bathroom

5 years

Calculated installed price

£2,070

Baxi 430 base £1,950 + £116.58 supply difference, rounded to the nearest £10.Check supply source

Combi-conversion basis. Final price depends on the property and installation requirements.

Request this boiler

35 kW

Glow-worm Ultimate3

Larger homes with stronger hot-water demand

5 years

Calculated installed price

£2,220

Baxi 436 base £2,050 + £172.45 supply difference, rounded to the nearest £10.Check supply source

35 kW is Glow-worm's nearest genuine match to Baxi 436.

Combi-conversion basis. Final price depends on the property and installation requirements.

Request this boiler

Longer-cover range

The nearest genuine extended-cover equivalents to the Baxi 800 range.

25 kW

Glow-worm Energy7 25C

Smaller homes wanting longer cover

7 years; up to 10

Calculated installed price

£1,980

Baxi 824 base £2,200 − £221.81 supply difference, rounded to the nearest £10.Check supply source

Combi-conversion basis. Final price depends on the property and installation requirements.

Request this boiler

30 kW

Glow-worm Energy7 30C

Family homes wanting longer cover

7 years; up to 10

Calculated installed price

£2,220

Baxi 830 base £2,500 − £280.1 supply difference, rounded to the nearest £10.Check supply source

Combi-conversion basis. Final price depends on the property and installation requirements.

Request this boiler

35 kW

Glow-worm Energy7 35C

Larger homes wanting longer cover

7 years; extended eligibility confirmed

Calculated installed price

£2,710

Baxi 836 base £2,800 − £91.15 supply difference, rounded to the nearest £10.Check supply source

Glow-worm's homeowner wording may exclude 35 kW from some extended guarantees, so ten years is not promised until confirmed.

Combi-conversion basis. Final price depends on the property and installation requirements.

Request this boiler

Included as standard

A properly documented installation.

New RF wireless room thermostat

Magnetic filter (where space allows)

Full chemical system treatment

Gas Safe certification

Boiler commissioning

Manufacturer warranty registration

How calculated prices work

Alternative-brand figures use Chris's matching Baxi installed price, then add or subtract the VAT-inclusive difference between comparable boiler, horizontal-flue and filter supply packages. Calculated totals are rounded to the nearest £10.

Labour, the RF thermostat, chemical treatment, certification and ordinary installation materials stay the same. Merchant prices can change, so every calculated comparison is checked again in the written quotation.

Request a written quotation

Not sure which output is right?

Use the boiler finder or request a quotation. Just Boilers NW will check the property before confirming the boiler and price.

Find my boiler