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The locomotive’s present boiler is number '''5895''', a Class B/'Standard 2' boiler built at Swindon in September 1939. It was first installed on another 5101 class locomotive, number 4135, in November 1939 and subsequently at the higher pressure of 225 psi on 6100 class locos 6154 (May 1946), 6122 (August 1949) and 6168 (April 1946) before being fitted to 4150 in October 1963. 4150 had previously used boilers number 5855 on entry to service followed by 5646 (1950), 2278 (1953) and 3378 (1956).<ref>Copy of GWR Engine History card and Boiler History card obtained by the 4150 Fund</ref><ref>[http://www.4150.org.uk/PDFs/The4150Fund-2016W-Newsletter.pdf 4150 Fund 2016 newsletter] (retrieved 23 February 2019)</ref>
A full report in 2008 from the SVR's boiler foreman and a further inspection in 2018 showed the boiler to be in good condition, having been fitted with a new inner firebox at its last overhaul. It was expected to require the standard repairs: new flues, tubes, steel stays replaced, crown stays replaced, foundation ring removed to check for grooving and replaced, welding repairs to front tube plate and possible boiler barrel patch. An inspection in 2018 confirms its generally good condition.
A record net total of almost £16,000 from the autumn 2007 [[Severn Valley Railway Association]] raffle proceeds were allocated to 4150 in 2008, which was ring-fenced for spending on the boiler.<ref>[http://www.4150.org.uk/4150_new-beginning.html 4150 Fund website] (Retrieved 20 January 2018)</ref>A further raffle in 2018 raised in excess of £24,500 before expenses.<ref>SVR News 202</ref><ref>[http://www.4150.org.uk/PDFs/The4150Fund-2019-Web-Newsletter.pdf 4150 Fund 2019 newsletter] (retrieved 23 February 2019)</ref>
By January 2018 the boiler and firebox cladding had been completed and then dismantled. The boiler had passed an ultrasonic test on the thickness of the plates and passed a non-destructive test for cracks. Work had commenced on drilling out firebox steel stays and grinding off rivet heads holding the foundation ring before the boiler headed north.<ref>Howard A, 4150 Fund Facebook, 20 January 2018</ref><ref>[http://www.4150.org.uk/news/4150_jan18.html The 4150 Fund - Restoration update January 2018]</ref>
The boiler was moved from Bewdley to Bridgnorth on 18 June 2018. {{As of|20192020|1}} it is in the boiler shop where work is under wayunderway.<ref>Shareholder update at AGM, 23 February 2019</ref> The rest of the locomotive will stay at Bewdley until the boiler overhaul is approaching completion, while remaining work on the bunker, cab fittings, cab floor, and valve and cylinder cladding is completed.<ref>Shareholder update email, 28 July 2018</ref>
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