We have been in the plumbing business for over thirty years we are a family owned. What's the cost of replacing your boiler? What’s going on at your library. The new plug n glow 2.7kw mini electric flow boiler is now available the plug n glow is perfect for stand alone underfloor or radiant heating in conservatories and other small areas, boosting existing systems or defrosting in a greenhouse plug n glow is ce marked and guaranteed for two years. Spend up to about.