Are you in need of a new compact combi boiler for your small to medium-sized Edinburgh home?

If so, the chances are that you’ve already heard of the Worcester Bosch Greenstar 25si – in fact, it’s probably the very reason you’re reading this blog!

Having had over 20 years of experience fitting and servicing Worcester Bosch boilers, I can personally vouch for the brand. However, if you’ve been wavering over this boiler, read on as I’ve reviewed it in full below.

Introduction

The 25si is a brilliant choice if your property is on the small side and you don’t have a lot of space, as these compact boilers will happily fit in a standard kitchen cupboard or Edinburgh press.

They’re also perfect if you love a good, hot shower in the morning (or any time, really!), however it’s not the ideal choice if you have a bath, as it’ll be very slow to fill. Read on for this boiler’s exact specifications.

Output and flow rate

With a heating output of 24 kw, the 25si will comfortably heat a small to medium-sized property with around 5 – 9 radiators. As for the hot water output, this boiler will provide 25 kw to your taps, with a flow rate of around 10.2 litres per minute.

As I mentioned above, the 25si is ideal for running a shower (although not a rain shower), but if you also have a bath, I’d recommend sizing up to the 30si, which has a higher flow rate but exactly the same heating output.

TIP: I’ve compared the 25si and 30si more closely in this blog post)

Size and special features

Coming in at 690mm x 390mm x 280mm, the 25si is the perfect compact size for fitting in a kitchen cupboard or Edinburgh press – which is a huge bonus if space is a premium in your home. And since it’s a combi, you won’t need any extra tanks taking up room,either!

This boiler is fully compatible with Worcester Bosch’s Wave control system, and also comes with an in-built Condensesure siphon which has been proven to effectively prevent a frozen condensate at temperatures below -15°C for a sustained period of time. Score!

Guarantee

Another benefit of the 30si is that it comes with the brand’s brilliant 9-year no-quibble guarantee when fitted by an accredited installer – as long as you install it with Worcester Bosch’s own filter and controls – it’s a bit of an extra cost, but worth it in my opinion.

This is a market-leading guarantee and one I recommend to most of my customers, as there are no hidden charges or small print. Plus, Worcester Bosch has its own dedicated engineers ready to attend call-outs if something does happen to go wrong with your boiler.

TIP: Just remember to ensure your boiler is serviced annually by a Gas Safe registered engineer, otherwise your extra-long guarantee won’t stay valid!

Tech specs

Below, I’ve put together everything you need to know about the 25si, at a glance:

• Heating output: 24 kw
• Hot water output: 25 kw, 10.2 litres per minute (slow to fill a bath)
• Ideal for: Small to medium-sized properties with one shower room and 5 – 9 radiators
• ERP rating: A
• Guarantee: 9 years (when fitted by an accredited installer, with Worcester Bosch’s own filter and controls)

Conclusion

I hope you’ve enjoyed reading my review of the Worcester Bosch Greenstar 25si, and by now you should have a better idea of whether or not it’s suited to your home – however, always get an engineer to measure your home’s heat loss to check it’s definitely the right output!

Do you have any other questions about the Greenstar 25si? Let me know in the comments section, and I’ll endeavour to answer as soon as I can!